选择两列包含值组合的所有行

Question

Here's my schema:

CREATE TABLE T (A CHAR(1), B CHAR(1));
INSERT INTO T (A, B) VALUES('1', '1');
INSERT INTO T (A, B) VALUES('2', '2');
INSERT INTO T (A, B) VALUES('1', '2');

I wan't to select rows where columns A and B contain a combination of values. For example, lets say I want to find combinations A=1,B=1, and A=2,B=2, and nothing else. If it were a single value, I could use the IN statement, but when I try this:

SELECT * FROM T WHERE A IN ('1', '2') AND B IN ('1', '2')

I get back all three rows.

How can I match a combination of values?

Answer 1

Is this what you're looking for using OR with parentheses?

select * 
from T
where ( A = '1' AND B = '1' ) OR ( A = '2' AND B = '2' )

• SQL Fiddle Demo

Answer 2

You can check this query :

SELECT * FROM T WHERE (A,B) IN (('1', '1'),('2', '2'));

see given link below

Click here

Answer 3

you can use something like below sql

SELECT * FROM T WHERE (A == B) AND A IN ('1', '2');