1drop table if exists t1,t2; 2select 0<=>0,0.0<=>0.0,0E0=0E0,"A"<=>"A",NULL<=>NULL; 30<=>0 0.0<=>0.0 0E0=0E0 "A"<=>"A" NULL<=>NULL 41 1 1 1 1 5select 1<=>0,0<=>NULL,NULL<=>0; 61<=>0 0<=>NULL NULL<=>0 70 0 0 8select 1.0<=>0.0,0.0<=>NULL,NULL<=>0.0; 91.0<=>0.0 0.0<=>NULL NULL<=>0.0 100 0 0 11select "A"<=>"B","A"<=>NULL,NULL<=>"A"; 12"A"<=>"B" "A"<=>NULL NULL<=>"A" 130 0 0 14select 0<=>0.0, 0.0<=>0E0, 0E0<=>"0", 10.0<=>1E1, 10<=>10.0, 10<=>1E1; 150<=>0.0 0.0<=>0E0 0E0<=>"0" 10.0<=>1E1 10<=>10.0 10<=>1E1 161 1 1 1 1 1 17select 1.0<=>0E1,10<=>NULL,NULL<=>0.0, NULL<=>0E0; 181.0<=>0E1 10<=>NULL NULL<=>0.0 NULL<=>0E0 190 0 0 0 20create table t1 (id int, value int); 21create table t2 (id int, value int); 22insert into t1 values (1,null); 23insert into t2 values (1,null); 24select t1.*, t2.*, t1.value<=>t2.value from t1, t2 where t1.id=t2.id and t1.id=1; 25id value id value t1.value<=>t2.value 261 NULL 1 NULL 1 27select * from t1 where id <=>id; 28id value 291 NULL 30select * from t1 where value <=> value; 31id value 321 NULL 33select * from t1 where id <=> value or value<=>id; 34id value 35drop table t1,t2; 36create table t1 (a bigint unsigned); 37insert into t1 values (4828532208463511553); 38select * from t1 where a = '4828532208463511553'; 39a 404828532208463511553 41select * from t1 where a in ('4828532208463511553'); 42a 434828532208463511553 44drop table t1; 45