How can I do 'insert if not exists' in MySQL?

mysqlsqlsql-insertprimary-keyunique-constraint
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How do I UPDATE from a SELECT in SQL Server?

sqlsql-servertsqlselectsql-update
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Why is SELECT * considered harmful?

sqldatabase
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Calculate a Running Total in SQL Server

sqlsql-servertsqlcumulative-sum
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Update statement with inner join on Oracle

sqloracleinner-joinora-00933
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