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POHow does SQL Server Wildcard Character Range, eg [A-D], work with Case-sensitive Collation?
 

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  1. POHow does SQL Server Wildcard Character Range, eg [A-D], work with Case-sensitive Collation?
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    <p>Can anyone explain the rules for how a wildcard character range, eg [A-D], works with a case-sensitive collation?</p> <p>I would have thought the following</p> <pre><code>WHERE CharColumn LIKE '[A-D]%'; </code></pre> <p>would return only records which start with an upper case A, B, C or D, and exclude records that start with a lower case a, b, c or d.</p> <p>However, in reality, it appears to return records that start with an upper case A but also records that start with B or b, C or c and D or d. It's like only the first character of the range is case-sensitive and the remaining characters in the range are not case-sensitive. </p> <p>On the other hand, the following </p> <pre><code>WHERE CharColumn LIKE '[ABCD]%'; </code></pre> <p><strong>does</strong> only return records which start with an upper case A, B, C or D. Yet I would have thought [A-D] would be equivalent to [ABCD].</p> <p>I get the same results in SQL Server 2005 and SQL Server 2008 R2.</p> <p>Example:<br> (insert statements written with SQL Server 2008 row constructors for compactness. If each value is given its own insert statement the script will work in SQL Server 2005)</p> <pre><code>CREATE TABLE #TEST_LIKE_Patterns ( ID INT IDENTITY(1,1), CharColumn VARCHAR(100) COLLATE Latin1_General_CS_AS ); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('aaa'), ('aAA'), ('AAA'), ('Aaa'); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('bbb'), ('bBB'), ('BBB'), ('Bbb'); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('ccc'), ('cCC'), ('CCC'), ('Ccc'); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('ddd'), ('dDD'), ('DDD'), ('Ddd'); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('eee'), ('eEE'), ('EEE'), ('Eee'); -------------- INSERT INTO #TEST_LIKE_Patterns (CharColumn) VALUES ('fff'), ('fFF'), ('FFF'), ('Fff'); -------------- -- Raw Data: SELECT * FROM #TEST_LIKE_Patterns; SELECT * FROM #TEST_LIKE_Patterns WHERE CharColumn LIKE '[A-D]%'; -- Results: /* ID CharColumn -------------- 3 AAA 4 Aaa 5 bbb 6 bBB 7 BBB 8 Bbb 9 ccc 10 cCC 11 CCC 12 Ccc 13 ddd 14 dDD 15 DDD 16 Ddd */ SELECT * FROM #TEST_LIKE_Patterns WHERE CharColumn LIKE '[ABCD]%'; -- Results: /* ID CharColumn -------------- 3 AAA 4 Aaa 7 BBB 8 Bbb 11 CCC 12 Ccc 15 DDD 16 Ddd */ </code></pre>
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