DATEADD ('week', 1, [due date]) Add 280 days to the date February 20, 2021. When an input value includes a time zone, Amazon Redshift uses the time zone to convert the value to UTC and stores the UTC value. The default timestamp for a date value is 00:00:00. CURRENT_DATE returns 10/01/08, not. In Redshift, you can use datediff () and arithmetics: select t. The first expression in a range condition must be the lesser value and the second expression the greater value. CREATE FUNCTION public. BigQuery also supports a separate DATE_DIFF function that will return the difference between two date types, unlike the DATETIME_DIFF that only supports the datetime type. <code_block1> – The code block. I know that I can do another query to then get the max ID but I would ideally like to just go by timestamp. tstamp, TIMESTAMP (timezone=False))) Share. However, this is not the case. date 1. You can execute the Redshift Datepart in the form given below. The fully timestamp values contains default value as (00) for missing seconds. When you use the sysdate function with date_diff, be aware that the value the sysdate function returns is datetime. inventory_date::date))) * 12 + EXTRACT (month FROM age ('2020-12-20'::date. For more information, see Date parts for date or timestamp functions. Misalnya, anggaplah bahwa Anda menghitung perbedaan dalam tahun antara dua tanggal, 12-31-2008 dan 01-01-2009. You can create an Amazon Redshift column with a BPCHAR (blank-padded character) type, which Amazon Redshift converts to a fixed-length CHAR (256) column. The COPY command is able to read from multiple data files or multiple data streams simultaneously. See moreDATEDIFF. id, CASE WHEN CAST (DATEDIFF (minute, u1. Remember Redshift is a cluster of networked computers and while their clocks are sync'ed this isn't perfect. select dateadd (m,30, '2008-02-28' ); date_add --------------------- 2008-02-28 00:30:00 (1 row) You can name date parts in full or abbreviate them. You can create orders with the following. It would handle. Expected behavior On using the datediff function on redshift, it should give a normal result. Specify an OLE DB server type other. 有关更多信息，请参阅 日期或时间戳函数的日期部分 。. Learn more about CollectivesCurrently, my code just returns zero on the right side of the decimal place. However, since the requirement is to generate monthly reports which I would assume to be a. If the first date is later than the second date, the result is positive; otherwise, the result is negative. We can use multiple column or single column at one time to fetch data from table. For example, month truncates to the first day of the month. That isn't the same. 0. The result is the same in all three cases. If the first date is later than the. ; ExamplesThis will draw the distinct pairs of id's and dates out and rejoin them onto the dataset only where the joined dates are earlier than the row in question. 0'. DECLARE @Date0 date = '2016-04-07'; -- Thursday. DATE_DIFF function Examples. For example, adding three months or 12 days to a starting date. Datetime types. CASE statement in DateDiff (Amazon Redshift) 19. 0 / 60 / 24 as diff from mytable t. Follow. The default timestamp without time zone (TIMESTAMP) format is YYYY-MM-DD HH:MI:SS. date_diff("unknown", timestamp without time zone, timestamp with time zone) does not exist So I guess that current_timestamp returns a timestamp with a timezone and getdate() a timestamp without. SELECT * FROM (SELECT CONVERT (timestamp, '1970-01-01 00:00:00') as Fixed_Date, DATEDIFF (Second, Fixed_Date::timestamp, COALESCE (u_time_to_detection::timestamp, fixed_date::timestamp,'1970-01-01 00:00:00') )as TTD_seconds, row_number () over. 000', @EndTime datetime = '2016-05-10 03:31:00. 1. g. In SQL Server Management Studio, open Object Explorer, expand Server Objects, right-click Linked Servers, and then click New Linked Server. Use the TIMESTAMPTZ data type to input complete timestamp values that include the date, the time of day, and a time zone. usage_limit: character(150) List of usage limit IDs reached by the query. For example, if date1 equals 2022-July-04 and date2 equals 2021-July-04, you would expect a difference of one year when you use the datediff function. select last_day (sysdate); last_day ------------ 2014-01-31. A Soundex code is a string that is four characters long. select to_date ( '20010631', 'YYYYMMDD', FALSE ); The result is July 1, 2001, because there are only 30 days. 3333 etc. Redshift clusters can be configured for different kinds of workloads as per the requirement. I am trying to calculate difference between two dates in dbeaver connected to apache drill. On the General Page, type the name of the instance of SQL Server that you area linking to. Ex: If start_date = 1/1/2016 15:30 and end_date = 2/1/2016 00:30 then I need the break up with group by start_date: 8+0. Consider SQL Server function to calculate the difference between 2 dates in months: SQL Server : -- Difference between Oct 02, 2011 and Jan 01, 2012 in months SELECT DATEDIFF ( month, '2011-10-02', '2012-01-01') ; -- Result: 3. The following code snippet provides an example of this behavior: SELECT datediff (DAYS, '2021-01-01'::DATE, '2021-02-01'::DATE) AS datediff_interval_output , datediff ('day', '2021-01-01. Each value that Amazon Redshift stores or retrieves has a data type with a fixed set of associated properties. An event 13. You should use Amazon Athena if you want to run interactive ad hoc SQL queries against data on Amazon S3, without having to manage any infrastructure or clusters. Add a comment. 19. Aug 17, 2021 at 11:13. TIMEZ: Time with time zone info (since time in New York is behind that in Tokyo, for instance, time zones reflect this difference) TIMESTAMP: Includes. Use DATEDIFF to get the seconds between the two datetimes: DATEDIFF(second,'2014-09-23 00:00:00. Source: Based on the solution here. Out of curiosity I executed: select datediff(day, getdate(), current_timestamp); and got the following error: function pg_catalog. 2 Answers. The rub is that one date is a converted integer value in YYYYMMDD format and the second date field is a timestamp. The timestamptz type is a recent addition to Redshift. date_from, evnt. Under its hood, Redshift has a massively parallel processing architecture. All in One Excel VBA Bundle. Push out all due dates by one week. select dateadd (m,30, '2008-02-28' ); date_add --------------------- 2008-02-28 00:30:00 (1 row) You can name date parts in full or abbreviate them. select to_date ('02 Oct 2001', 'DD Mon YYYY'); to_date ------------ 2001-10-02 (1 row) The following SQL statement converts the string 20010631 to a date. The opposite change, a decrease in wavelength and simultaneous increase in frequency and energy, is known as a blueshift, or negative redshift. The date function used to returns the difference between two date or datetime values as a given unit of duration. Consider SQL Server function to calculate the difference between 2 dates in weeks: SQL Server : -- Difference between Dec 22, 2011 and Dec 31, 2011 in weeks SELECT DATEDIFF ( week, '2011-12-22', '2011-12-31') ; -- Result: 1. Count ----- 124. HLLSKETCH type. 0 Kudos. The following example will always return zero rows due to the. Now I am trying to make this query dynamic such that it can give me count for past 6 weeks something like below as an output: Count Week ------------ 124 W43 125 W42 126 W41 127 W40 128 W39 129 W38. Share. SELECT (EXTRACT(epoch from age('2017-6-15', now())) / 86400)::intThe popular one here is DATE_DIFF(): DATE_DIFF() – get the difference between two dates in any specificity (days, years). e. You cannot specify the date. The following queries show an example of how to calculate the completion_days as the difference between eco_date and orginated_date. If the result is positive, the Secure Agent returns negative values and if the result is negative, the positive value is returned. Im working with quantities of times represented as an absolute number of seconds in my data pipeline. fromtimestamp (epoch) ' LANGUAGE plpythonu IMMUTABLE; See Redshift documentation on UDF for details. The following example finds the difference in number. Redshift Date functions: LAST_DATE function. dd/mm/yyyy), which makes me suspect that your SQL implementation is set up to parse them as some other format (e. We named this one. Instead: select (case when 1=1 then datediff (month, '2009-01-01', '2009-12-31') else datediff (month, '2009-01-01', '2009-12-31') end) as nummonths; I assume this is oversimplified code, because obviously the case is not needed in any. Part of AWS Collective. 0 (long ago). start_date < '2016-01-01'::date is doing a proper comparison between two date fields. *, lead (description) over (partition by company_id, user_id order by timestamp) as next_description, lead (timestamp) over. The DIFFERENCE function compares the American Soundex codes of two strings. person_id = t2. Athena charges per-query, based on the bytes of data scanned and rounded up to the nearest MB, at a rate of $5 per terabyte (though this can vary by region). For example, the dateadd() is one of the functions provided by Redshift. Returns the count (signed integer) of the specified datepart boundaries crossed between the specified startdate and enddate. The spectrum allows for a seamless analysis since it is directly embedded into the Amazons framework. There are two types of CASE expressions: simple and searched. Step 2: Add the Amazon Redshift cluster public key to the host's authorized keys file; Step 3: Configure the host to accept all of the Amazon Redshift cluster's IP addresses; Step 4: Get the public key for the host; Step 5: Create a manifest file; Step 6: Upload the manifest file to an Amazon S3 bucket; Step 7: Run the COPY command to load the dataThe blocking_pid column shows the process ID of the session that's holding the lock. This question is in a. 以下示例查找过去日期和今天日期中的文本值之间的差异（以季度数为单位）。此示例假定当前日期为 2008 年 6 月 5 日。您可以可以用全名或缩写来命名日期部分。datediff 函数的默认列名称为 date_diff。However, you can query any catalog table or view openly if your query does not involve a join to an Amazon Redshift table. At the time of insertion date into the timestamp datatype column, the value of date will be implicitly converted into the fully timestamp value. The following example returns the number of tickets sold for each of the last 7 days of the month. Redshift provides 2 kinds of node resizing features: Elastic resize; Classic resize; Elastic Resize. This gets the year difference between the birth date and the current date. Share. I'm trying to Implement Netezza AGE function in Redshift as a UDF. That is go from this: 2013-12-17 12:27:50 to this: 2013-12-17 12:27:00 I have tried the following: SELECT da. And only do that for one day ranges. Snowflake is a complete SaaS offering that requires no maintenance. Month name (uppercase, mixed-case, lowercase, blank. After you run a query, a Result tab appears with the results. Then, the last_value function will take last value per row and the distinct removes all irrelevant rows from the output. Just to clarify SQL server seems to require DATEDIFF (datepart, recentDate, olderDate) as startdate and enddate are a bit nebulous. Seconds. person_id AND t1. You can use these interval literals in conditions and calculations that involve datetime expressions. All it does, is calculates the normal difference in days and then subtracts 2 (non-business) days from this result for each beginning of the week. 5 for 1/1/2016. This is a guide to Redshift join. select pg_timezone_names (); To view a list of supported time zone. timeworkedfrom >= date_trunc ('month', current_date) - interval '6. Many companies are using Amazon Redshift to analyze and transform their data. It’s based on PostgreSQL 8. Data types are declared when tables are created. Neste caso, a função retorna 1 ano, apesar do fato de que essas datas são apenas um dia de diferença. This function returns the truncated timestamp or interval with a particular level of precision. With AUTO distribution, Amazon Redshift assigns an optimal distribution style based on the size of the table data. DATE_PART ( datepart, {date|timestamp} ) The above syntax has 2 parameters: Datepart: This is the interval/range we require from a certain date. For the rest I use new_start and new_end - 1 second. Redshift. Returns the <date> with the specified number <interval> added to the specified <date_part> of that date. 25 per hour and scales up to petabytes of data and thousands of concurrent users. how many days exist between date number one and date number two) you’d use something like DATE_DIFF(‘day’, ‘2019-01-01’, ‘2019-01-06’). The SQL I have isSql server supports adding and subtracting on Datetime data type, so you can simply do something like this: DECLARE @StartTime datetime = '2016-05-10 02:25:34. #Datediff redshift how to; #Datediff redshift how to. In my Redshift table I have 2 columns that stores timestamp values: start_date_time and end_date_time. DC2. createddate, table2. Example. With the argument ALL, the function retains all duplicate values from the expression for. 2. Example 5: Use Current Date. Pramit is a Technical Content Lead at Chaos Genius. GitHub Gist: instantly share code, notes, and snippets. The same query was executed in both the environments. A date field or a call to another function that outputs a date. select id, state from data a join (select state, max (time) as most_recent from data group by 1) b on a on a. 1, I used the below subquery to select the max date. Arguments. For possible values, see Date parts for date or timestamp functions. The values in the CALDATE column are dates. Boolean type. how to get date difference between two dates using DateDiff Excluding the weekends. When your query uses multiple federated data sources Amazon Redshift runs a federated subquery for each source. However when i run the same logic on actual data. 697401. if dlr. If the result is positive, the Secure Agent returns negative values and if the result is negative, the positive value is returned. numbers WITH RECURSIVE number_series (number) AS ( SELECT 1 UNION ALL SELECT number + 1 FROM number_series. 18. Unfortunately this. Of course, it doesn't make much sense to subtract a timestamp from itself, because that obviously returns 0, but I assume you just run that as a test. createddate, Datediff (day, table1. Getting the differences between two specified time values where the time is specified in the format of YYYY-MM-DD HH-MM-SS. I think you need an alias for your subquery. Find centralized, trusted content and collaborate around the technologies you use most. Por exemplo, suponha que você esteja calculando a diferença em anos entre duas datas, 12-31-2008 e 01-01-2009. (DATEDIFF(sec,starttime,endtime)) avg_duration, MIN(starttime) as oldest_ts,. 0 engine is available. Tens of thousands of customers use Amazon Redshift to process exabytes of data per […] Especificamente, DATEDIFF determina o número de limites da parte da data que são cruzados entre duas expressões. It appears that Redshift supports two possible functions for computing a time interval distance between two DATE -like objects: DATEDIFF () & date_diff (). For example, because the common calendar starts from the year 1, the first decade (decade 1) is 0001-01-01 through 0009-12-31, and the second decade (decade 2) is 0010-01-01 through 0019-12-31. date_from) = 1. Each cluster runs an Amazon Redshift engine and contains one or more databases. Più precisamente, DATEDIFF determina il numero di limiti di parte di data tra due espressioni. 3. The following example table TIME_TEST has a column TIME_VAL (type TIME) with three values inserted. Why is. In Redshift, we need another way. Below are some of the tasks you can do with AWS: Host dynamic websites and run web and application servers in the cloud over EC2. 0. Here expr2 is lesser than expr1, so the return value is negative. La parte specifica del valore di data o ora (anno, mese o giorno, ora, minuto, secondo, millisecondo o microsecondo) su cui la funzione opera. Boolean type. amazon-redshift; typecasting-operator; or ask your own question. SELECT * FROM tickets t LEFT JOIN d_customer c ON c. {date|timestamp} A date column, timestamp column, or an expression that implicitly converts to a date or timestamp. Consider SQL Server function to calculate the difference between 2 dates in months: SQL Server : -- Difference between Oct 02, 2011 and Jan 01, 2012 in months SELECT DATEDIFF ( month, '2011-10-02', '2012-01-01') ; -- Result: 3. The following example finds the difference, in number of quarters, between a literal value in the past and today's date. NAME, table2. However, we will have to exclude. This guide provides examples of converting timestamps and offers insights into supported time zone names and abbreviations. It calculates the difference in years between the birth date and the date in one year (minus one day) to account for partial years. Using Amazon Redshift. its a subtraction between 2 different tables that i need in business days. Syntax DATEDIFF(endDate string, startDate string) → integer endDate: A DATE or TIMESTAMP expression. amazon-redshift; or ask your own question. PostgreSQL - Date Difference in Months. To get the complete list of possible values, please refer to the Redshift Documentation. Takes three arguments, the start date, the end date. We use the following syntax: if <condition> <code_block1> else <code_block2> endif. If you do not want to skip the rows, you will need to load the date into a VARCHAR field (which will not cause an error) and later you will need to convert the VARCHAR into a DATE. The parameterized snippet below can be used to find the number of weekdays between 2 dates. 7k 2 2 gold badges 53 53 silver badges 83 83 bronze badges. Redshift has a strict mode that is turned off by default - TO_DATE(string, format, is_strict=false). Redshift Create Table; Redshift DateDiff; ADVERTISEMENT. datediff (year, dob, current_date + interval '1 year' - interval '1 day') as age. The first date in the comparison. Find out key distinctions in architecture, performance, scaling, pricing—and more!Amazon Redshift accepts different date formats, including ISO date time strings. Datediff with join returning not expected result. LIMIT clauses, ORDER BY clauses, simple predicates, and complex expressions are pushed down to the connector to reduce the amount of data scanned and decrease query execution run time. Currently, my code just returns zero on the right side of the decimal place. Redshift is a fully managed data warehouse that exists in the cloud. Numeric functions to perform operations on numeric data. . Method 1: Querying Data in Redshift using AWS Query Editor. mwdb • 1 yr. Pramit is a Technical Content Lead at Chaos Genius. The second column gives the day of week (numerically, between 0 and 6). Syntax DATEDIFF(endDate string, startDate string) → integer endDate: A DATE or TIMESTAMP expression. A string literal that defines the format of the timestamp value. Hey guys, I am created a derived table in Looker and I understand it runs on redshift, as such, I trying to get something similar to below as an aggregated table: I have two tables: Customers and Orders I want to get Cust. e. Datetime types. SET SESSION max_recursion_rows = 500000000; SHOW max_recursion_rows; INSERT INTO facts. 1. El nombre predeterminado de la columna para la función DATEDIFF es DATE_DIFF. What is the Amazon Redshift DATEDIFF function? The Amazon Redshift DATEDIFF function returns the difference between the date parts of two date or time expressions. DATEDIFF with datepart function in Redshift SELECT DATEDIFF(year, '2021/08/25', '2027/08/25' ) AS DateDiff; -- Returns 6 DATEDIFF with datepart function equivalent in. MONTHS_BETWEEN determines the number of months between two dates. The expression is one of the following data types: With the argument DISTINCT, the function eliminates all duplicate values from the specified expression before calculating the minimum. In MySQL, you can use TIMESTAMPDIFF function. DATEDIFF returnes the number of full weeks between the datetime values. Redshift split from Postgres on V8. PostgreSQL - Date Difference in Months. I ran this in Redshift: SELECT FLOOR(DATEDIFF(day, '2022-01-01', '2023-01-01')/365) as age --1 (this seems right) SELECT FLOOR(DATEDIFF(day, '2022-01-01', '2023-01-01. Syntax TO_DATE ( string, format) TO_DATE ( string, format, is_strict) Arguments string A string to be converted. Per ulteriori informazioni, consultare Parti di data per funzioni di data e timestamp. You may change this: AND be. The Redshift Datepart function returns the interval value as an integer. You can directly convert the format by specifying the cast operator ( ‘::’) such as ::date, ::time, ::timestamp after the date string literal. 53 sec compared to 41. Join is very useful and important to join the tables in redshift. set timezone to ‘xxx36’; Examples. Write resolution instructions: Use bullets, numbers and additional headings Add Screenshots to explain the resolution Add diagrams to explain complicated technical details, keep the diagrams in lucidchart or in google slide (keep it shared with entire Snowflake), and add the link of the source material in the Internal comment section Go in. select 42602 * interval '1 second'; which return 11:50:02 the proper answer. Use CASE where a SQL expression is valid, such as in a SELECT command. AWS Redshift clusters require some manual maintenance. state = b. Because it addresses very different requirements, the specialized data storage schema and query execution engine that Amazon Redshift uses are completely different. format. Improve this answer. Performance. I’m pretty sure DATEDIFF is not a standard SQL function, and the name reeks of Microsoft-ese, so you’ll find a function of that name not only in SQL Server but in VBA, as one example. The default timestamp with time zone (TIMESTAMPTZ) format is YYYY-MM-DD HH:MI:SSOF, where OF is the offset from UTC (for example, -8:00. Modified 3 years, 7 months ago. 1. BigQuery also supports a separate DATE_DIFF function that will return the difference between two date types, unlike the DATETIME_DIFF that only supports the datetime type. Public Holiday. This is the documentation for the Amazon Redshift Developer Guide - amazon-redshift-developer-guide/r_DATEDIFF_function. According to our Support Engineers, you need to identify the session, PID responsible for the lock. e. Saved searches Use saved searches to filter your results more quicklyStrange SQLite does not have a DATEDIFF function. The time zone can be specified as a time zone name (such as 'Africa/Kampala' or 'Singapore') or as a time zone abbreviation (such as 'UTC' or 'PDT' ). Redshift Spectrum ignores hidden files and files. 3333 etc. Snowflake: DATEDIFF('day', start, stop) AS days Talha September 20th, 2021 Redshift is a completely managed data warehouse service offered by Amazon Web Services. This sql will give you the number of days between two dates as integer:. 1 Answer. Let’s look at the syntax, examples, and use cases of Redshift DATEDIFF function: Specifically, DATEDIFF determines the number of date part boundaries that are crossed between two expressions. select. I tested this query on Redshift with the help of Workbench J. Run the following query to. Out of curiosity I executed: select datediff(day, getdate(), current_timestamp); and got the following error: function pg_catalog. The data that is used by the job depends on the data type of a particular column. 具体而言，DATEDIFF 确定在两个表达式之间交叉的日期部分边界的数量。. Aggregation extensions. Learn how to convert timestamps from one time zone to another in Amazon Redshift using the convert_timezone() function. Sorted by: 1. Let’s look at the clear differences between the two. date1)) AS difference FROM t t1 INNER JOIN t t2 ON t1. tobymao closed this as completed in #1746 3 weeks ago. You can truncate date part such as hour, weeks, or months. 5, if diff is 8 hours - than 0. Database Developer Guide MONTHS_BETWEEN function PDF RSS MONTHS_BETWEEN determines the number of months between two dates. 005479 (1 year + 2/365 years). With a simple where clause, we tried to filter out rows from the data set. To release a lock, wait for the transaction that's holding the lock to finish. Skipping weekends. The following SQL statement converts the date 02 Oct 2001 into a date data type. Find out key distinctions in architecture, performance, scaling, pricing—and more! SELECT * FROM schemaName. Currently I am only returning 1. Check for locking issues and long running sessions or transactions. Check the Amazon Redshift Advisor recommendations. Usually, redshift is discussed when talking about the expansion of the universe. It appears that Redshift supports two possible functions for computing a time interval distance between two DATE -like objects: DATEDIFF () & date_diff (). 1. SQL Server DATEPART() function overview. The default Redshift release format is YYYY. Summary: in this tutorial, you will learn how to use the SQL Server DATEPART() function to extract a part of a date. WITH DateCte AS ( SELECT idcode, mydatetime, RANK () OVER ( ORDER BY idcode) AS CurrentRank, (RANK () OVER ( ORDER BY idcode) + 1 )AS NextRank FROM Table1 ) SELECT ce. Redshift query between date. Amazon Redshift is a popular cloud data warehouse, offering a fully managed cloud-based service that seamlessly integrates with an organization’s Amazon Simple Storage Service (Amazon S3) data lake, real-time streams, machine learning (ML) workflows, transactional workflows, and much more—all while providing up to 7. The input timestamp is truncated to the precision of the input datepart. In SSMS I would have done: SELECT DATEADD (yy, DATEDIFF (yy, 0, GETDATE ()), 0) AS StartOfYear. Note that unit values can be different in SQL Server DATEDIFF and MySQL TIMESTAMPDIFF. 4-digit, 3-digit, 2-digit, 1-digit International Organization for Standardization (ISO) year number. 15 between 2 values that are 1 year, 1 month and 15 days apart. In certain cases, such as string-based comparisons or when a result depends on a different timestamp format than is set in the session parameters, we recommend explicitly converting. Redshift doesn't support column data type alteration, so to do this you have to recreate the table DDL with timestamp data type for time columns, insert data to the new table and replace the old table with it. We started by testing the normal scan speed of the data set. AWS Redshift vs Snowflake: A quick comparison. SELECT DATE ('2023-07-22 15:30:45'); -- 結果: 2023-07-22 2. For example, if you are calculating the difference in years between two dates, 12-31-2008 and 01-01-2009, the function returns 1 year despite the fact that these dates are only one day apart. g. 5 . SELECT * FROM schemaName. eg: each ndc has fill_nbr = 1 as the initial fill. The Verdict. You can name date parts in full or abbreviate them. select datediff (day, saletime, last_day (saletime)) as. In PostgreSQL, you can take the difference in years, multiply by 12 and add. Side-note: In Redshift, CHARACTER VARYING is the same as TEXT, so you might as well use TEXT since it is shorter. This example uses the current date to find the difference between the current date and a specific date. How do I go about getting the first date of current year using Redshift? I am familiar with T-SQL/SQL in SSMS but I am not entirely sure how to do this in Redshift. Short description. cust_id = t. Snowflake vs Redshift - learn 10 differences between these DW. MySQL does. Date and Min Item number RELATED that that date. Redshift is limited only by the external data storage limitations. If the result is positive, the Secure Agent returns negative values and if the result is negative, the positive value is returned. I know this is a simple question, but I just started to explore Redshift and couldn't google the answer yet. Here is the code used in RS. Amazon Redshift automatically takes incremental snapshots that track changes to the cluster since the previous automated snapshot. 0. redshift datediff not working when current_timestamp is used but working when getdate() function is used. Create 1 day ranges new_start and new_end. What is the use of DATEDIFF in redshift? Redshift date_trunc. The first 6 is the difference (in months) between 01/10/2018 (October 1, 2018) and 30/04/2019 (April 4, 2019). Improve this answer. After you run a query, a Result tab appears with the results.