PostgreSQL 9.3:IF NOT NOT EXISTS

Question

我想检查数据库中是否存在该表.

IF NOT EXISTS (SELECT * from INFORMATION_SCHEMA.Tables WHERE Table_name = 'test') THEN

    RAISE INFO 'Not exists';

else

    RAISE INFO 'Exists';

end if;

得到错误:

ERROR:  syntax error at or near "IF"

Answer 1

DO
$do$
BEGIN
IF NOT EXISTS (SELECT * from INFORMATION_SCHEMA.Tables WHERE Table_name = 'test') THEN

    RAISE INFO 'Not exists';

else

    RAISE INFO 'Exists';

end if;
end;
$do$

你应该用block包围你的postgresql语句