PostgreSQL using variables
0
If I have a query like this:
SELECT COUNT(1) FILTER (WHERE type = 0) as first_sum,
COUNT(1) FILTER (WHERE type = 0) as second_sum,
first_sum + second_sum as final_sum
FROM ...
Is it possible to use some kind of variables to make this work?
sql postgresql
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
add a comment |
0
If I have a query like this:
SELECT COUNT(1) FILTER (WHERE type = 0) as first_sum,
COUNT(1) FILTER (WHERE type = 0) as second_sum,
first_sum + second_sum as final_sum
FROM ...
Is it possible to use some kind of variables to make this work?
sql postgresql
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
How aboutCOUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant
– Hambone
Nov 21 '18 at 19:28
add a comment |
0
0
0
If I have a query like this:
SELECT COUNT(1) FILTER (WHERE type = 0) as first_sum,
COUNT(1) FILTER (WHERE type = 0) as second_sum,
first_sum + second_sum as final_sum
FROM ...
Is it possible to use some kind of variables to make this work?
sql postgresql
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
If I have a query like this:
SELECT COUNT(1) FILTER (WHERE type = 0) as first_sum,
COUNT(1) FILTER (WHERE type = 0) as second_sum,
first_sum + second_sum as final_sum
FROM ...
Is it possible to use some kind of variables to make this work?
sql postgresql
sql postgresql
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
edited Nov 21 '18 at 19:29
Laurenz Albe
44.7k102746
44.7k102746
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
asked Nov 21 '18 at 18:45
sudoman281sudoman281
18212
18212
How aboutCOUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant
– Hambone
Nov 21 '18 at 19:28
add a comment |
How aboutCOUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant
– Hambone
Nov 21 '18 at 19:28
How about
COUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant– Hambone
Nov 21 '18 at 19:28
How about
COUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant– Hambone
Nov 21 '18 at 19:28
add a comment |
1 Answer
1
active
oldest
votes
1
Yes, that is perfectly possible, the technique is called “subquery”:
SELECT first_sum,
second_sum,
first_sum + second_sum AS final_sum
FROM (SELECT count(*) FILTER (WHERE type = 0) AS first_sum,
count(*) FILTER (WHERE type = 0) AS second_sum
FROM ...
) AS subq;
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Yes, that is perfectly possible, the technique is called “subquery”:
SELECT first_sum,
second_sum,
first_sum + second_sum AS final_sum
FROM (SELECT count(*) FILTER (WHERE type = 0) AS first_sum,
count(*) FILTER (WHERE type = 0) AS second_sum
FROM ...
) AS subq;
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
add a comment |
1
Yes, that is perfectly possible, the technique is called “subquery”:
SELECT first_sum,
second_sum,
first_sum + second_sum AS final_sum
FROM (SELECT count(*) FILTER (WHERE type = 0) AS first_sum,
count(*) FILTER (WHERE type = 0) AS second_sum
FROM ...
) AS subq;
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
add a comment |
1
1
1
Yes, that is perfectly possible, the technique is called “subquery”:
SELECT first_sum,
second_sum,
first_sum + second_sum AS final_sum
FROM (SELECT count(*) FILTER (WHERE type = 0) AS first_sum,
count(*) FILTER (WHERE type = 0) AS second_sum
FROM ...
) AS subq;
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
Yes, that is perfectly possible, the technique is called “subquery”:
SELECT first_sum,
second_sum,
first_sum + second_sum AS final_sum
FROM (SELECT count(*) FILTER (WHERE type = 0) AS first_sum,
count(*) FILTER (WHERE type = 0) AS second_sum
FROM ...
) AS subq;
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
answered Nov 21 '18 at 19:28
Laurenz AlbeLaurenz Albe
44.7k102746
44.7k102746
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
add a comment |
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
Ok thanks! That's what I thought. :) I was just wondering if there is any other (better) way.
– sudoman281
Nov 21 '18 at 19:37
add a comment |
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How about
COUNT(1) FILTER (WHERE type = 0) + COUNT(1) FILTER (WHERE type = 0)? Of course this will result in a null if either argument is null. Your example has them both with the same criteria, but presumably that's not what you meant– Hambone
Nov 21 '18 at 19:28