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I wonder if its possible to make query like this one:

SELECT cs.platform,
     (SELECT COUNT(*) FROM general_list as loc WHERE loc.platform=cs.platform) as indexed,
     (SELECT COUNT(*) FROM cs.table     as loc WHERE loc.platform=cs.platform) as sandbox
FROM (
    SELECT platform, table
    FROM states
    WHERE visible=1
) as cs

For each iteration in the main select, I need to take the table name from cs.table to info from such table.

Is there anyway to accomplish this?

  • Sorry, it was a bug! I have fixed it. Thanks. – Apalabrados Jan 18 '17 at 22:29
  • The field 'table' in states holds the table names. The issue is that in the second select (sandbox) I want to use the name of the table in the field (cs.table). – Apalabrados Jan 18 '17 at 22:36
  • Please, it is not clear, add your table schema. – McNets Jan 18 '17 at 22:38
  • I suppose you're trying to use the content of table field on a FROM sentence. You should have a look at dynamic queries. – McNets Jan 18 '17 at 22:42
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The only way to "dynamically" use a tablename is via a Stored Routine in which you do CONCAT(...) to build the SQL, plus PREPARE and EXECUTE to then perform the constructed SQL.

Needing to do this is usually a sign of poor schema design. Please explain the schema and why you went that direction; we may be able to help 'fix' it.

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