You could also shorten a bit your original approach by using the simple version of CASE expression WHEN value THEN. Generate_series(date '', date '', interval '6 days') AS s(d0) The DATEPART() function extracts a subfield from a date or time value. Summary: in this tutorial, we will introduce you to the PostgreSQL DATEPART() function that allows you to retrieve subfields e.g., year, month, week from a date or time value. It uses 4 bytes for storing a date value in a column. Introduction to the PostgreSQL DATEPART function. Here is the specific SQL for to calculate the week. Given this, I prefer it over other solutions for these two DBMS’s. Read more about ISOWEEKNUM () and WEEKDAY () in the Google Docs Help Center. To get the corresponding year, use YEAR ( A1 -WEEKDAY ( A1, 2)+4). Another option is to use the LPAD () function to pad a number with leading zeros. To get the ISO week number (1-53) from a date in cell A1, use ISOWEEKNUM ( A1). ![]() The function converts the number to a string, using the (optional) format we specify. A second number from ‘ 00:00:00’ UTC: The second number: HOUR: The hour numbered like (0-23) The hour number: ISODOW: A day of the given week which is defined on ISO 8601 Monday to Sunday: NIL: ISOYEAR: ISO 8601 week number of year: NIL: MICROSECONDS: seconds with fractional parts, which is multiplied with ‘1000000.’ Similar. In PostgreSQL, we can use the TOCHAR () function to add leading zeros to a number. This solution works with MySQL and PostgreSQL and is a SQL standard. 2 Ways to Add Leading Zeros in PostgreSQL. Solution 1 Use EXTRACT() to Calculate Week Number. I think the shortest and most elegant way to solve this issue is to use date_trunc('quarter',d) (which will retrieve the start of the quarter) + 3 months - 1 day, and use the expression to create a FUNCTION: CREATE FUNCTION end_of_quarter (d date)ĬAST(date_trunc('quarter', d) + interval '3 months' - interval '1 day' AS date) Postgres uses the DATE data type for storing different dates in YYYY-MM-DD format. Keep in mind the week number starts at 1 and, depending on how the calendar laysout, go past 52.
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