Return row only if value doesn't exist

mysqlsql
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Get records with max value for each group of grouped SQL results

mysqlsqlgreatest-n-per-group
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generate days from date range

datetimemysqlsqlbetween
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PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)

phpmysqlpdo
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PHP - Using PDO with IN clause array

phpmysqlpdoprepared-statementin-clause
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