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  1. #1
    Junior Member
    Join Date
    Jun 2018
    Member #

    How do I calculate how many each number originally in the first table met once?

    There are two tables, for example telephones, the second is names. Join each other via Left join. Accordingly, the records are duplicated. how to calculate how many each number was originally in the first table met once?
    XoXo 22coders


  3. #2
    Junior Member
    Join Date
    Aug 2019
    Member #
    6 times
    This is one way to do this:

    WITH list AS (SELECT x FROM table 1)
    SELECT count(y) FROM table2 WHERE tel IN (SELECT * FROM list)

    Please post your attempts so far in order to understand your question better.
    Last edited by sibert; Sep 15th, 2019 at 09:42 AM.

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