# # system functions # select database(); select charset(database()); select database() = "test"; select database() = _utf8"test"; select database() = _latin1"test"; select user() like "%@%"; select user() like _utf8"%@%"; select user() like _latin1"%@%"; select charset(user()); select version()>="3.23.29"; select version()>=_utf8"3.23.29"; select version()>=_latin1"3.23.29"; select charset(version()); explain extended select database(), user(); create table t1 (version char(40)) select database(), user(), version() as 'version'; show create table t1; drop table t1; select TRUE,FALSE,NULL;