Actually might be a simple question:

Given 2 tables:

```
table1: A,B,C
(A1,B1,28471),
(A1,B2,01244),
(A2,B1,1283a),
(A2,B2,82r7e);
table2: A,B,D,E,F,G
(A1,B1,18,1,6,8),
(A2,B2,18,2,3,0),
(A3,B1,18,7,1,4),
(A4,B2,18,1,9,6);
```

Will the following statement result in a the following result given the example tables:

```
SELECT E,F,G FROM table2 WHERE (A,B) IN (SELECT A,B FROM table1)
```

expected result:

```
E F G
(1,6,8), -- (A1,B1)
(2,3,0); -- (A2,B2)
```

Can someone confirm this is a valid method to select based on tuples?

asking as the most likely next step is to UPDATE the E field by adding +5 for matching results

## Best Answer

Consider

instead:`EXISTS`

db<>fiddle hereEquivalent and typically cheaper.

And the negation

`NOT EXISTS`

is not as treacherous as the discouraged (not completely equivalent)`NOT IN`

. See:Aside, I would call

`(A,B)`

a "composite type" or "row type" rather than a "tuple".