By Itzik Ben-Gan

ISBN-10: 0735626014

ISBN-13: 9780735626010

Do not buy this e-book if you are a T-SQL newbie. The identify made me imagine the e-book will be aimed at basic/foundational techniques. this can be totally no longer the case, notwithstanding i am very serious about having this as an amazing mid to complicated point reference down the road.

I've been a SQL process Administrator for a few years, yet by no means had to comprehend the queries, simply find out how to safeguard, backup and get better the databases. Thank goodness my husband was once in a position to translate for me! for that reason I supply it a 1.5 famous person ranking for brand new clients yet a 4.5 score for T-SQL directors. as soon as i used to be in a position to comprehend what he was once attempting to say, and reference the […] web site to damage the queries into achievable bites, the lighting fixtures got here on.

I have now bought a couple of different T-SQL books and surely, this certain reference becomes my grasp. in spite of the fact that i could not do that with no taking the 1st classes in additional introductory fabric. cannot wait to be a guru and truly comprehend this beast of a booklet!

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Extra resources for Microsoft SQL Server 2008 T-SQL Fundamentals (PRO-Developer)

Example text

But remember, a query filter "accepts TRUE," meaning that it rejects both rows for which the logical expression evaluates to FALSE and those for which it evaluates to UNKNOWN. So this query returned rows in which a value was present in the region attribute and that value was different than WA. It returned neither rows where the region attribute was equal to WA nor rows where region was NULL. You will get the exact same output if you use the predicate NOT (region = N'WA') because in the rows where region is NULL and the expression region = N'WA' evaluates to UNKNOWN, NOT (region = N'WA') evaluates to UNKNOWN also.

When you want to sort by an expression in ascending order, you either specify ASC right after the expression, such as orderyear ASC, or don't specify anything after the expression because ASC is the default. If you want to sort in descending order, you need to specify DESC after the expression, such as orderyear DESC. SQL and T-SQL both allow you to specify in the ORDER BY clause ordinal positions of columns based on the 40 41 order in which the columns appear in the SELECT list. For example, in the query in Listing 2-4, instead of using: ORDER BY empid, orderyear You could use: ORDER BY 1, 2 However, this is considered bad programming practice for a couple of reasons.

7403352515240647040566 (830 row(s) affected) The OVER clause is also supported with four ranking functions: ROW_NUMBER, RANK, DENSE_RANK, and NTILE. OrderValues ORDER BY val; val) val) val) val) AS AS AS AS rownum, rank, dense_rank, ntile This query generates the following output: orderid ----------10782 10807 10586 10767 10898 10900 10883 11051 10815 10674 ... 50 821 822 823 824 825 826 827 828 829 830 821 822 823 824 825 826 827 828 829 830 786 787 788 789 790 791 792 793 794 795 10 10 10 10 10 10 10 10 10 10 47 (830 row(s) affected) The ROW_NUMBER function assigns incrementing sequential integers to the rows in the result set of a query, based on logical order that is specified in the ORDER BY subclause of the OVER clause.

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Microsoft SQL Server 2008 T-SQL Fundamentals (PRO-Developer) by Itzik Ben-Gan


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