By default, two pipe characters (||) are treated as a logical OR operator in MariaDB. However, you can change this behaviour if you like.
You can update your sql_mode to include the PIPES_AS_CONCAT option, in which case two pipes will be treated as a concatenation operator.
There are quite a few ways to add this option to your sql_mode. You can add it explicitly. Or you can set your sql_mode to an option that sets it implicitly.
I run through these options below.
In SQLite, we can use the strftime() function to return datetime values in our chosen format.
Therefore, we can use it to extract the day, month, and year from a date.
When using the TO_CHAR() function to format a number in Oracle Database, you can use the S format element to return its sign (i.e. a plus sign for positive values, and a minus sign for negative values).
You can also use the MI format element to return negative values with a trailing negative sign, and positive values with a trailing blank.
MySQL supports the use of the pipe concatenation operator (||) for concatenating its operands. However, you need to enable it first.
PostgreSQL provides us with several ways to get the day, month, and year from a date.
Three functions that immediately come to mind are; DATE_PART(), EXTRACT(), and TO_CHAR().
When using SQLcl with Oracle Database, you can export your query results to an XML file with the SPOOL command.
Here’s an example of formatting a number as currency in MariaDB.
Some DBMSs provide us with the ability to format a number as a currency by providing a format specifier for the currency symbol. Providing such a format specifier allows the DBMS to return the appropriate currency symbol for the locale.
MySQL doesn’t have a currency format specifier, and so we need to do a bit of extra work if we want the currency symbol to be returned.