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PHP & MYSQL: using group by for categories
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SQL -- How is DISTINCT so fast without an index?
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Comma Separated values with SQL Query
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group_concat in SQL Server 2008
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SQL query that concatenates values from duplicate rows in a single table
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How do I perform a GROUP BY on an aliased column in MS-SQL Server?
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SQL - assorting data
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Multiple select statements in Single query
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Using LIMIT within GROUP BY to get N results per group?
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Simple SQLServer PIVOT/Transposed query, how to write?
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SQL: how to select a single id ("row") that meets multiple criteria from a single column
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Is it possible to make a recursive SQL query?
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How do I use T-SQL Group By
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Select distinct for one column and many in another column
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How do I create a user-defined aggregate function?