Cleansing User Passwords

phpsqlpdohash
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Fetch the rows which have the Max value for a column for each distinct value of another column

sqlgreatest-n-per-grouporacle
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Get top 1 row of each group

sqlgreatest-n-per-groupsql-serversql-server-2005tsql
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What is the difference between "INNER JOIN" and "OUTER JOIN"?

sqljoindatabaseinner-joinouter-join
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Parameterize an SQL IN clause

sqlparameterssql-server-2008
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