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INSERTING VALUES IN A TABLE USING CHECK CONSTRAINT

  • October 17, 2008 at 5:40 am

    #214137

    HELLO MY NAME IS GEORGE BEGINNER IN SQL

    MY QUESTION IS THAT ,I WANT TO CREATE A TABLE WITH ONE FIELD WHICH HAS TO INSERT ONLY THREE VALUES AFTER THAT FIELD INSERT THRE VALUES IT SHOULD NOT BE ABLE TO INSERT MORE VALUES

    IN DETAIL IF MY TABLE NAME IS 'SOURCE' WHICH CONTAIN ONLY ONE FIELD, NAMED 'CATEGORY'OF TYPE VARCHAR I ONLY WANT TO ENTER THREE VALUES IN THIS AS 'LAND','AIR','WATER' I SHOULD BE ABLE TO INSERT ONLY THIS VALUES AND TEHRE SHOULD BE NO DUPLICATION OF THESE VALUES AND NO OTHER VALUES SHOULD BE INSERTED IS IT POSSIBLE USING CHECK CONSTRAINT . IF NOT USING STORED PROCEDURES

    I AM EXPECTING AN EARLY REPLY

  • October 17, 2008 at 5:56 am

    #886284

    this sounds very much like a homework assignment....

    aside from that...

    you want to do a few things....

    you said only three specific values.... as you suspected, read about CHECK CONTRAINTS in you books online.

    you might also want to make the column NOT NULL when you build the table, so it cannot be blasnk either.

    to force a column to be unique, you'll want to read about UNIQUE CONSTRAINTS in books online as well.

    the combination of those three should get you where you want to go.

    show us what you've built so far and we could offer some more insight.

    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!

  • October 17, 2008 at 9:09 am

    #886434

    And please don't post in all caps. It's the online equivalent of shouting at someone. It's also hard to read.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

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