khajlk :
I have two tables tbl1 (552 rows) and tbl2 (257 rows) with unequal rows in my PostgreSQL database (PG 9.5, x64 Windows). The tables tbl1 and tbl2 contain the following data (sample shown here):
Grp id val1 val2 sum
1 1 112 142 5.2
1 2 124 137 6.7
1 3 136 189 6.8
1 4 112 114 9.8
1 5 130 145 6.1
1 6 142 130 7.7
Grp id sum
1 1 5.2
1 3 6.8
1 6 7.7
For each group in table 1, I am trying to select rows where "id" in the first table is not equal to "id" of second table. For example, my expected output would be:
Grp id val1 val2 sum
1 2 124 137 6.7
1 4 112 114 9.8
1 5 130 145 6.1
I have tried this query so far but it doesn't work, and return empty output.
SELECT
a.grp, a.id,
a.val1, a.val2, a.sum
FROM tbl1 a
WHERE NOT EXISTS (
SELECT *
FROM tbl2 b WHERE b.grp = a.grp AND b.id != a.id
)
Can someone help on this and explain what am I doing wrong?
forpas :
Since you are using NOT EXISTS the condition you need is b.id = a.id and not b.id != a.id:
...................
WHERE b.grp = a.grp AND b.id = a.id
...................
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