811
811
select conv("18383815659218730760",10,10) + 0;
812
812
conv("18383815659218730760",10,10) + 0
814
814
select "18383815659218730760" + 0;
815
815
"18383815659218730760" + 0
817
817
CREATE TABLE t1 (code varchar(10));
818
818
INSERT INTO t1 VALUES ('a12'), ('A12'), ('a13');
819
819
SELECT ASCII(code), code FROM t1 WHERE code='A12';