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Asked: 2026-06-11T04:37:46+00:00

I want muliti table join.it’s show 1 data/show 2 record But really 1 data/1

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I want muliti table join.it’s show 1 data/show 2 record But really 1 data/1 record.

select acl.Person_ID as 'CODE'
,pnr.FullName as 'FullName'
,case acl.persontype when 'normal' then 'normal' end as 'Type'
From tbl_aculog acl left join tbl_PerNR pnr On acl.Person_ID=pnr.Person_ID

union

select acl.Person_ID as 'CODE'
,ps.FullName as 'FullName'
,case acl.persontype when 'blacklist' then 'blacklist' end as 'Type'
From tbl_aculog acl left join tbl_Person ps On acl.Person_ID=ps.NPerson_ID

Result:

Person_ID |    FullName |    Type
00010132 |  Stin|         normal
00010132 |  NULL |        NULL
00000579 |  Plom |        normal
00000579 |  NULL |        NULL
00001081 |  Watson |          normal
00001081 |  NULL |        NULL
5211080 |   SOPIT |       blacklist
5211080 |   NULL |        NULL

**Fields Person_ID & FullName & Type is NULL VALUE.

I want Result:

Person_ID |    FullName |    Type
00010132 |  Stin|         normal
00000579 |  Plom |        normal
00001081 |  Watson |          normal
5211080 |   SOPIT |       blacklist

Thank you very much for your time 😀

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1 Answer

  1. Editorial Team

    To remove NULLs from your result, you need to specify WHERE acl.persontype IS NOT NULL to ignore empty ‘persontype’.

    select acl.Person_ID as 'CODE'
,pnr.FullName as 'FullName'
,case acl.persontype when 'normal' then 'normal' end as 'Type'
From tbl_aculog acl left join tbl_PerNR pnr On acl.Person_ID=pnr.Person_ID
WHERE acl.persontype IS NOT NULL

union

select acl.Person_ID as 'CODE'
,ps.FullName as 'FullName'
,case acl.persontype when 'blacklist' then 'blacklist' end as 'Type'
From tbl_aculog acl left join tbl_Person ps On acl.Person_ID=ps.NPerson_ID
WHERE acl.persontype IS NOT NULL

    Edit 1

    The use of an INNER JOIN will remove NULLS.

    select acl.Person_ID as 'CODE'
,pnr.FullName as 'FullName'
,case acl.persontype when 'normal' then 'normal' end as 'Type'
From tbl_aculog acl inner join tbl_PerNR pnr On acl.Person_ID=pnr.Person_ID

union

select acl.Person_ID as 'CODE'
,ps.FullName as 'FullName'
,case acl.persontype when 'blacklist' then 'blacklist' end as 'Type'
From tbl_aculog acl inner join tbl_Person ps On acl.Person_ID=ps.NPerson_ID
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