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Iterate throught database tables

  • March 18, 2015 at 12:00 pm

    #316330

    MS SQL 2008

    I want to execute a delete query on certain tables in my database to delete some rows in the tables.

    The tables selected has a certain name pattern (the name ends with "Temp").

    So I can do this to get a list of the table names

    SELECT name

    FROM sys.Tables where

    name like '%Temp'

    Now I want to check each table to see if it has a column with the name "DateStamp" and then execute a delete query as follows:

    delete form TableName where

    DateStamp is < '2010-01-01'

    In other words I need to iterate through the tables names

    How to do this?

  • March 18, 2015 at 12:19 pm

    #1784866

    you can find every column namedDateStamp, and it's tablename (but it might be VIEWNAME !!) you can join to sys.tables and then sys.columns as instead

    select

    'delete from '

    + quotename(object_name(object_id))

    + ' WHERE '

    + quotename(name)

    +' < 2010-01-01'';'

    from sys.columns

    where name = 'DateStamp'

    then you can copy and paste the code to execute, after you reviewed it of course

    Lowell

    --help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!

  • March 18, 2015 at 12:53 pm

    #1784886

    How to add one more condition that the table name ends with "Temp"

    I am trying to do an inner join, so far no success yet.

  • March 18, 2015 at 12:58 pm

    #1784889

    techzone12 (3/18/2015)

    How to add one more condition that the table name ends with "Temp"

    I am trying to do an inner join, so far no success yet.

    here's a full example:

    select

    'delete from '

    + quotename(tabz.name)

    + ' WHERE '

    + quotename(colz.name)

    +' < 2010-01-01'';'

    from sys.tables tabz

    inner join sys.columns colz

    on tabz.object_id = colz.object_id

    where colz.name = 'DateStamp'

    and tabz.name like '%temp'

    Lowell

    --help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!

  • March 18, 2015 at 1:30 pm

    #1784894

    I am amazed with the quality of answers on this site. Fast and accurate, but yet efficient code.

    Thanks for the help

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