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Editorial Team
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Asked: 2026-06-13T23:05:07+00:00

I have a table1 containing duplicate column value Table1 id code 1 201202 0000

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I have a table1 containing duplicate column value

Table1

id   code
1   201202  0000    1111
2   201202  0000    9999
3   201203  0000    9999
4   201203  0000    0999
5   201204  1000    1999
6   201204  2000    2999
7   201205  3000    3999
8   201205  4000    4999
9   201205  5000    5999

Table 2

id   numbers
1   2012020010  
2   2012024929  
3   2012033838
4   2012052434
5   2012052229
6   2012052232

I want to count all the numbers in table2 that are substring of distinct code in table 1
i.e. result should be

code   frequency
201202   2
201203   1
201205   3

I have been able to get all the numbers for every code but can’t figure out how to count them

SELECT DISTINCT table1.code , table1.id, table2.number AS ph_npa, count( * )
FROM table1
INNER JOIN table2 ON substr( table2.number, 1, 6 ) = table1.code
GROUP BY table1.number

any help is appreciated.

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1 Answer

  1. Editorial Team

    ok I got it working and query is super fast

    SELECT

    DISTINCT A.code as code,
    B.Counts AS frequency
    FROM table1 AS A

    INNER JOIN (

    SELECT substr( number, 1, 6 ) AS subnumber, count( 1 ) AS Counts
    FROM table2
    GROUP BY substr( number, 1, 6 )
    )
    AS B ON A.code = B.subnumber

    i.e.
    select the number and frequency of number from table 2
    and then join with distinct code form table 1

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