SELECT data FROM two tables in MySQL
Solution 1
By using UNION
you may get several times rows with the same ID. What about using LEFT JOIN
?
If I've understood your question:
SELECT table_zero.id, table_1.varchar_field, table_2.varchar_field
FROM table_zero
LEFT JOIN table_1 ON table_zero.id = table_1.id
LEFT JOIN table_2 ON table_zero.id = table_2.id
WHERE table_1.varchar_field LIKE '%str%'
OR table_2.varchar_field LIKE '%str%'
Solution 2
Try this
SELECT *
FROM
(
SELECT table_zero.id AS ID, table_1.varchar_field AS field
FROM table_zero
JOIN table_1 ON table_zero.id = table_1.id
WHERE table_1.varchar_field LIKE '%str%'
UNION
SELECT table_zero.id, table_2.varchar_field AS field
FROM table_zero
JOIN table_2 ON table_zero.id = table_2.id
) tbl
WHERE
tbl.field LIKE '%str%'
Solution 3
SELECT table_zero.id, table_1.varchar_field, table_2.varchar_field
FROM table_zero
LEFT JOIN table_1 ON table_zero.id = table_1.id
LEFT JOIN table_2 ON table_zero.id = table_2.id
WHERE table_1.varchar_field LIKE '%str%'
OR table_2.varchar_field LIKE '%str%'
Comments
-
Mark Tower about 4 years
What I have: The next structure:
table_zero
-> id (PRIMARY with auto increment)
-> othertable_1
-> id (foreign key to table zero id)
-> varchar(80) Example value: (aahellobbb)
-> one_fieldtable_2
-> id (foreign key to table zero id)
-> varchar(160) Example value: (aaececehellobbb)
-> other_fieldWhat I want: Search and get an (id,varchar) array containing all matches with the LIKE '%str%' on the varchar field. For example, if I search with the "hello" string, then I should get both example values with their respective ids. These ids are always going to be different, since they are references to a PRIMARY KEY.
What I tried: I tried with UNION ALL but it does not work with LIMITS in my example.
-
Mark Tower about 11 yearsThanks for answering. It works fine for me but I get a pair of two fields called "name". Each pair has one NULL value and the matched string. Is this normal? I know its due to the double table search... but, it just seems strange. Thanks for your answer ;)
-
Frosty Z about 11 yearsIf you would like only one field in your results containing the matched string, you can use
COALESCE(table_1.varchar_field, table_2.varchar_field) AS matched_string
instead oftable_1.varchar_field, table_2.varchar_field
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Mark Tower about 11 yearsThanks, but Frostys one was the definitive one ;D Vote-up anyway!
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e-info128 about 10 yearsExcesive use of memory, select 200.000 rows limit 0, 10 in 20 seconds when intent order by one column.