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Apr 12 2019

Table Value Constructors in SQL Server 2008 – Simple Talk

#sql #server #value


Table Value Constructors in SQL Server 2008 - Simple Talk, REMMONT.COM

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Table Value Constructors in SQL Server 2008

It turns out that the MERGE statement updated the ProductAmt values for the Mountain-300, Road-250, and Helmet-racing products. However, the statement added rows for the Mountain-700 and Road-550 products because those products did not match any of the product names that already existed within the table.

Conclusion

As you can see, TVCs can be used in a number of ways within your DML statements. Keep in mind, however, that a TVC is limited to 1000 rows, and, as stated earlier, each row value expression must return a scalar value, otherwise you ll receive a syntax error when you try to run your statement. TVCs represent a simplification of syntax rather than new functionality. You can do almost everything you can with a TVC in previous versions of SQL Server, barring the use of the DEFAULT keyword.

You can find more information about TVCs by referring to the topic Table Value Constructor (Transact-SQL) in SQL Server Books Online. There you will also find additional examples of the various ways to use TVCs.

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  • After being dropped 35 feet from a helicopter and spending the next year recovering. Robert Sheldon left the Colorado Rockies and emergency rescue work to pursue safer and less painful interests—thus his entry into the world of technology. He is now a technical consultant and the author of numerous books, articles, and training material related to Microsoft Windows, various relational database management systems, and business intelligence design and implementation. He has also written news stories, feature articles, restaurant reviews, legal summaries, and the novels ‘Last Stand’ and ‘Dancing the River Lightly’. You can find more information at http://www.rhsheldon.com.

    Nice one.
    Thanks Robert for the clear roundup.

    This is the first time I ve seen UNION ALL written in this way.

    SELECT 101, Bikes
    UNION SELECT ALL 102, Accessories
    UNION SELECT ALL 103, Clothes

    I ve always written it as

    SELECT 101, Bikes
    UNION ALL SELECT 102, Accessories
    UNION ALL SELECT 103, Clothes

    hmmm .not sure which one I prefer.

    aha confused now.
    I see now that it s not the same thing!

    select all 1
    UNION
    select all 1 returns 1 row whereas

    select all 1
    UNION all
    select all 1 returns 2 rows.

    aha confused now.
    If I m not mistaken, you should have written

    SELECT 101, Bikes
    UNION ALL SELECT 102, Accessories
    UNION ALL SELECT 103, Clothes

    as the ALL of the type SELECT ALL 102, Accessories’ has no effect. It s the default alternative to DISTINCT.

    Re confused
    That was a wierd corruption in the setting phase of the article. Fixed now: Don t even ask how that crept in but all code was checked and executed beforehand!

    and they talk about portability .
    Nice article, Robert. Well done.

    is equivalent and runs on all versions of SQL Server.

    That s exactly why I don t use TVC s in any of my posts on SQLServerCentral especially on really simple coded answers. Since 2k5 and 2k8 have a lot of the same functionality everywhere else, it just makes life easier on everyone.

    Awesome
    I was using an IN statement with a list of values. I replaced the IN statement with a JOIN to a VALUES statement and a list of my values. Query returned in 30 seconds as opposed to before where it just spun for two minutes.

    cool
    never knew you could use VALUES inside the from clause, seems like a weird syntax but nice to know its there

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