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)
Các toán t so sánh trong SQLử
Ta vẫn dùng giả sử phía trên, a=10, b=20.
Toán
tửMô tảVí dụ
=
Ki m tra xem giá tr c a 2 toán h ng hai bên d u ể ị ủ ạ ở ấ
b ng có b ng nhau không, n u có b ng thì đi u ki n là ằ ằ ế ằ ề ệ
true.
(a = b)
không true.
!= Ki m tra xem giá tr c a 2 toán h ng có b ng nhau ể ị ủ ạ ằ
không, n u khác thì đi u ki n là true.ế ề ệ (a != b) là
true.
<> Ki m tra xem giá tr c a 2 toán h ng có b ng nhau ể ị ủ ạ ằ
không, n u không b ng thì đi u ki n là true.ế ằ ề ệ (a <> b) làs
true.
>
Ki m tra xem giá tr c a toán h ng bên trái có l n h n ể ị ủ ạ ớ ơ
giá tr c a toán h ng bên ph i không, n u có thì đi u ị ủ ạ ả ế ề
ki n là true.ệ
(a > b)
không true.
<
Ki m tra xem giá tr c a toán h ng bên trái có nh h n ể ị ủ ạ ỏ ơ
giá tr c a toán h ng bên ph i không, n u có thì đi u ị ủ ạ ả ế ề
ki n là true.ệ
(a < b) là
true.
>=
Ki m tra xem giá tr c a toán h ng bên trái có l n h n ể ị ủ ạ ớ ơ
ho c b ng giá tr c a toán h ng bên ph i không, n u có ặ ằ ị ủ ạ ả ế
thì đi u ki n là true.ề ệ
(a >= b)
không true.
<=
Ki m tra xem giá tr c a toán h ng bên trái có nh h n ể ị ủ ạ ỏ ơ
ho c b ng giá tr c a toán h ng bên ph i không, n u có ặ ằ ị ủ ạ ả ế
thì đi u ki n là true.ề ệ
(a <= b) là
true.
!< Ki m tra xem giá tr c a toán h ng bên trái là không nhể ị ủ ạ ỏ
h n giá tr c a toán h ng bên ph i không, n u có thì ơ ị ủ ạ ả ế (a !< b) là