In PostgreSQL, we can use the + operator to add one or more months to a date. There are several options when it comes to specifying the actual number of months.
Tag: dates
Return the End of the Month in SQLite
In SQLite, we can use the following method to calculate the last day of a given month.
We can base this either on the current date, or on some other specific date.
Continue readingReturn the Start of the Month in SQLite
SQLite gives us the ability to return the date of the beginning of the month, based on a given date.
This means we can return the date of the first day of the current month, or the first day of the month based on a date that we specify.
This allows us to perform further calculations on the resulting date, like adding a given number of days to it.
Continue readingSubtract Years from a Date in SQLite
In SQLite, we can use the DATE() function to subtract one or more years from a date.
For datetime values, we can use the DATETIME() function.
Add Days to a Date in PostgreSQL
The + operator allows us to add one or more days to a given date in PostgreSQL. We have a few options when it comes to specifying the actual number of days.
SQLite DATEADD() Equivalent
SQLite doesn’t have a DATEADD() function like SQL Server (or an ADDDATE() or ADD_DATE() function like in some other DBMSs), but it does have the DATE() function that can make additions to a date value.
SQLite also has a DATETIME() function that can make additions to a datetime value (as well as a TIME() function for time values).
Subtract Days from a Date in PostgreSQL
We can subtract one or more days from a date in PostgreSQL with the - operator.
PostgreSQL DATEADD() Equivalent
Updated 20 April 2024 to include the date_add() function.
SQL Server has its DATEADD() function that adds an interval to a date value. MySQL’s DATE_ADD() and ADDDATE() for does the same thing, as does MariaDB’s DATE_ADD() and ADDDATE(). SQLite has a DATE() function that also provides the option of adding an interval to a given date.
Prior to version 16, PostgreSQL didn’t have a DATEADD() or equivalent function. But with PostgreSQL 16 came with the introduction of the date_add() function, which allows us to add an interval to a timestamp with time zone.
We can also add and subtract values from dates with date/time operators such as + and -.
How to Format the Month in Roman Numerals in Oracle
Oracle Database provides us with the ability to return the month from a date using roman numerals.
For example, if the month is August, its decimal value would be 08 and it’s roman numeral equivalent would be VIII.
The way to do this is to use the RM or rm format element in your format mask. That will format the month using roman numerals in uppercase or lowercase respectively.
Specifying the date format can be done in several places.
Continue readingHow to Remove the Right Padding on the Day Name in Oracle
In Oracle Database, when using the TO_CHAR() function to return the day name from a date, padding will be appended to the day name if it’s shorter than the longest valid day name for the given language and calendar.
Well, that’s the default behaviour. However, you can change this if you wish.
To suppress this padding, all you need to do is prepend the day name format element with fm.