11.22. 'YESTERDAY'

Available inDSQL, PSQL, ESQL

TypeCHAR(9)

'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 11.19, “'TODAY'”.

Examples 

  |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;