Compare multiple text criteria to text field in single query? - sql

Question

I have a list of multiple text criteria that I need to use to count occurrences of matching text in the database with the LIKE operator.
How can I write a query that will run the comparison with all criteria at once and return a summarized list of counts per each of these criteria?
I've started with a simple query on which I'd like to iterate using a while loop. But unfortunately, I don't have the right to create a table that would contain the criteria to be referenced with each loop so I have to prepare query for each criteria separately.
SELECT sum(X), sum(Y), Z
FROM table
WHERE text LIKE 'criteria sample'
WHERE A = nnnnnn
AND B > 0
Group by Z
To avoid running and writing multiple queries, how can I load all criteria into one query to run them against the content to get the results faster out?

Answer 1

You can construct a table in the query with your values:
SELECT v.comparison, sum(t.X), sum(t.Y), t.Z
FROM table t JOIN
(VALUES ('criteria sample'),
('criteria sample 2'),
. . . -- whatever the values are
) v(comparison)
ON t.text LIKE v.comparison
WHERE t.A = nnnnnn AND t.B > 0
GROUP BY v.comparison, t.Z;

Answer 2

If you wanted every matching row, you could simply say WHERE text LIKE '%foo%' OR text LIKE '%bar%'. However, if I understand your question, you actually want a count of rows matching '%foo%' and a separate count of rows matching '%bar%'. This implies that the SUMs and GROUP BY have to be run separately for each criteria text.
One possible solution is to write all the queries separately, then union them at the end. Note that union requires every column to have a name. You'll also want a static identifier string in each subquery so you can tell which criteria was met. So you'll have something like:
SELECT sum(X) AS sumx, sum(Y) AS sumy, Z, 'foo' AS criteria FROM table WHERE text LIKE '%foo%' AND A = nnnnnn AND B > 0 Group by Z
UNION
SELECT sum(X) AS sumx, sum(Y) AS sumy, Z, 'bar' AS criteria FROM table WHERE text LIKE '%bar%' AND A = nnnnnn AND B > 0 Group by Z
UNION
...(etc)...

Answer 3

I think it should just work like this, if I'm understanding correctly.
select t.z,
sum(case when text like '%firstcriteria%' then 1 else 0 end) as countfirstcriteria,
sum(case when text like '%secondcriteria%' then 1 else 0 end) as countsecondcriteria
from table t
where A = 'nnnnnn'
AND B > 0
group by t.z

Answer 4

Like should follow with % symbol so that the word you are looking for is captured even if there a words before or after it. I also removed the redundant WHERE
SELECT sum(X), sum(Y), Z
FROM table
WHERE text LIKE '%criteria sample%'
AND A = 'nnnnnn'
AND B > 0
Group by Z