Validation SQL Defaults

Database SQL
DB2 SELECT DISTINCT(CURRENT TIMESTAMP) FROM SYSIBM.SYSTABLES
Empress SELECT DISTINCT(TODAY) FROM SYS_TABLES
Informix SELECT DISTINCT CURRENT TIMESTAMP FROM INFORMIX.SYSTABLES
MySQL SELECT NOW()
Oracle SELECT SYSDATE FROM DUAL
Postgres SELECT NOW()
SQLServer SELECT GETDATE()
Sybase SELECT GETDATE()

メモ。http://docs.solarmetric.com/ref_guide_dbsetup.htmlから。
hsqldbはなんだったけ…