Available inDSQL, PSQL, ESQL


Description'YESTERDAY' is not a variable but a string literal. It is, however, special in the sense that when you CAST() it to a date/time type, you will get the date of the day before. See also Section 9.17, 'TODAY'.


select 'Yesterday' from rdb$database
-- returns 'Yesterday'
select cast('Yesterday as date) from rdb$database
-- returns e.g. 2011-10-02
select cast('YESTERDAY' as timestamp) from rdb$database
-- returns e.g. 2011-10-02 00:00:00.0000

Shorthand syntax for the last two statements:

select date 'Yesterday' from rdb$database;
select timestamp 'YESTERDAY' from rdb$database;