I'm trying to nest this query, but I am getting the error: invalid input syntax for type boolean: "%malfunction%".
select *
from (
select column_one, column_two
from table
group by column_one, column_two
) as new_table
where column_two like '%false%' or '%malfunction%' or '%accidental%' or '%mistaken%'
order by column_one
Column_two is not boolean but it's identifying it as one.
I feel like I'm missing something small, but I can't find it. Help!
You can use any(array[...]), example:
with test (col) as (
values
('pear'), ('banana'), ('apple')
)
select *
from test
where col like any(array['%ea%', '%ba%']);
col
--------
pear
banana
(2 rows)
Correct syntax is something like select col1, col2,
from table_name
where condition1 OR condition2 OR condition3 ...;
Related
I'm trying to INSERT into a table a column that is part of another column in another table using TSQL, but I get the error stating that there is more than one value returned when I used that subquery as an expression. I understand what causes the error, but I can't seem to think of a way to make it produce what I want.
I'm trying to do something similar to:
A.Base B.Reference C.Wanted
--- ---- ----
abcdaa aa abcdaa
bcdeab bb cdefbb
cdefbb cc efghcc
defgbc ddd fghddd
efghcc
fghddd
So I'm using the code:
INSERT INTO C ( [Some other column], Wanted )
SELECT
A.[Some other column],
, CASE
WHEN LEN( B.Reference ) = 2 THEN
( SELECT A.Base FROM A WHERE RIGHT( A.Base, 2 ) =
( SELECT B.Reference FROM B WHERE LEN( B.Reference ) = 2 )
)
WHEN LEN( B.Reference ) = 3 THEN
( SELECT A.Base FROM A WHERE RIGHT( A.Base, 3 ) =
( SELECT B.Reference FROM B WHERE LEN( B.Reference ) = 3 )
)
END
FROM
A
, B
Which will return me the "more than 1 value" error. Honestly, I'm probably making this way more convoluted than it needs to be, but I've been staring at these tables for a while now.
I hope I'm getting the idea across as to what I'm trying to do.
If you know the records aren't duplicate, and you are sure your JOIN between A and B works (as Martin mentioned) can't you just select distinct to return just the unique records?
I'd try it like this:
--Create a mockup with declared table variables and test data
DECLARE #tblA TABLE(someColumnInA VARCHAR(100));
DECLARE #tblB TABLE(someColumnInB VARCHAR(100));
DECLARE #tblC TABLE(someColumnInC VARCHAR(100));
INSERT INTO #tblA VALUES
('abcdaa')
,('bcdeab')
,('cdefbb')
,('defgbc')
,('efghcc')
,('fghddd')
INSERT INTO #tblB VALUES
('aa')
,('bb')
,('cc')
,('ddd');
--The query
INSERT INTO #tblC(someColumnInC)
SELECT SomeColumnInA
FROM #tblA a
WHERE EXISTS(SELECT 1 FROM #tblB b WHERE a.someColumnInA LIKE '%' + b.SomeColumnInB + '%');
SELECT * FROM #tblC;
The idea in short:
After creating a mockup (please do this next time in advance) we use a query to insert all values from #tblA into #tblC as long as there exists any value in #tblB, which is part of the current value in #tblA.
How about doing something like this?
select *
from A
where RIGHT(A.Base,2) IN (select B.Reference FROM B WHERE LEN(B.Reference) = 2)
UNION ALL
select *
from A
where RIGHT(A.Base,3) IN (select B.Reference FROM B WHERE LEN(B.Reference) = 3)
For example, where the element is 'hi', and where N is 3, I need a PostgreSQL snippet I can use in a SELECT query that returns the following array:
['hi', 'hi', 'hi']
Postgres provides array_fill for this purpose, e.g.:
SELECT array_fill('hi'::text, '{3}');
SELECT array_fill('hi'::text, array[3]);
The two examples are equivalent but the 2nd form is more convenient if you wish to replace the dimension 3 with a variable.
See also: https://www.postgresql.org/docs/current/functions-array.html
You may use array_agg with generate_series
select array_agg(s) from ( values('hi')) as t(s) cross join generate_series(1,3)
Generic
select array_agg(s) from ( values(:elem)) as t(s) cross join generate_series(1,:n)
DEMO
sql demo
with cte as (
select 'hi' as rep_word, generate_series(1, 3) as value
) -- ^^^ n = 3
select array(SELECT rep_word::text from cte);
I am trying to test users for a condition, then select all events of the main table that match the condition. I feel like I am doing something wrong:
WITH users_table AS (
SELECT
user_name,
SUM (CASE WHEN ( ud.age > 20 ) THEN 1 ELSE 0 END) AS UserEvents
FROM users_data AS ud
GROUP BY user_name
)
SELECT users_table.user_name FROM users_table
WHERE users_table.UserEvents > 10
;
That is, I want to use the with clause to make a table of all the users above the age of 20, then of that table select only use users that has more than 10 events.
For some reason I keep getting the error:
ERROR: multiple WITH clauses not allowed. SQL state: 42601
But I don't understand why? Also, why "multiple" with clauses...? There's only one with clause.
Best wishes,
-R
When you are using multiple common table expressions, you can only use the WITH keyword once. So it should look like:
WITH first_cte AS (
SELECT ...
),
second_cte AS (
SELECT ...
)
If I try to UNION (or INTERSECT or EXCEPT) a common table expression I get a syntax error near the UNION. If instead of using the CTE I put the query into the union directly, everything works as expected.
I can work around this but for some more complicated queries using CTEs makes things much more readable. I also just don't like not knowing why something is failing.
As an example, the following query works:
SELECT *
FROM
(
SELECT oid, route_group
FROM runs, gpspoints
WHERE gpspoints.oid = runs.start_point_oid
UNION
SELECT oid, route_group
FROM runs, gpspoints
WHERE gpspoints.oid = runs.end_point_oid
) AS allpoints
;
But this one fails with:
ERROR: syntax error at or near "UNION"
LINE 20: UNION
WITH
startpoints AS
(
SELECT oid, route_group
FROM runs, gpspoints
WHERE gpspoints.oid = runs.start_point_oid
),
endpoints AS
(
SELECT oid, route_group
FROM runs, gpspoints
WHERE gpspoints.oid = runs.end_point_oid
)
SELECT *
FROM
(
startpoints
UNION
endpoints
) AS allpoints
;
The data being UNIONed together is identical but one query fails and the other does not.
I'm running PostgreSQL 9.3 on Windows 7.
The problem is because CTEs are not direct text-substitutions and a UNION b is invalid SELECT syntax. The SELECT keyword is a mandatory part of the parsing and the syntax error is raised before the CTEs are even taken into account.
This is why
SELECT * FROM a
UNION
SELECT * FROM b
works; the syntax is valid, and then the CTEs (represented by a and b) are then used at the table-position (via with_query_name).
At least in SQL Server, I can easily do this - create two CTE's, and do a SELECT from each, combined with a UNION:
WITH FirstNames AS
(
SELECT DISTINCT FirstName FROM Person
), LastNames AS
(
SELECT DISTINCT LastName FROM Person
)
SELECT * FROM FirstNames
UNION
SELECT * FROM LastNames
Not sure if this works in Postgres, too - give it a try!
I have a postgresql table that looks like this:
a|b|c|result
0|3|6|50
0|3|7|51
0|4|6|52
0|4|7|53
1|3|6|54
1|3|7|55
1|4|6|56
1|4|7|57
Is there an easy way to SELECT something like:
a|result for b=3|result for b=4
0|sum(50,51) |sum(52,53)
1|sum(54,55) |sum(56,57)
In other words, how to convert the groups of values of b into columns of aggregate functions like sum(), avg(), or others?
Thanks for your comments.
Not sure I understand your question completely, but I think you are looking for case.
-- drop table if exists sample;
create table sample
(a int,
b int,
c int,
result int);
insert into sample values
(0,3,6,50),
(0,3,7,51),
(0,4,6,52),
(0,4,7,53),
(1,3,6,54),
(1,3,7,55),
(1,4,6,56),
(1,4,7,57)
;
select
a,
sum(case when b = 3 then result end) as result_for_b3,
sum(case when b = 4 then result end) as result_for_b4
from
sample
group by
a
Result:
a;result_for_b3;result_for_b4
1;109;113
0;101;105
And if you (but I hope you don't) need to have output exactly as in your question, than you need to use string_agg function:
select
a,
'aggreg(' || string_agg(case when b = 3 then result end::varchar, ',') || ')' as result_for_b3,
'aggreg(' || string_agg(case when b = 4 then result end::varchar, ',') || ')' as result_for_b4
from
sample
group by
a
Result:
a;result_for_b3;result_for_b4
0;aggreg(50,51);aggreg(52,53)
1;aggreg(54,55);aggreg(56,57)