169
178
insert ignore into t1 values(NULL,100),(NULL,110),(NULL,120);
170
179
insert ignore into t1 values(NULL,10),(NULL,20),(NULL,110),(NULL,120),(NULL,100),(NULL,90);
171
180
insert ignore into t1 values(NULL,130),(NULL,140),(500,110),(550,120),(450,100),(NULL,150);
175
181
select * from t1 order by id;