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Tips and tricks of MySQL.

MySQL is probably the best known relational database management system. As the “M” of the LAMP web development platform, this open-source solution i…

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PostgreSQL ORDER BY statement.

PostgreSQL ORDER BY statement is used to sort records in your result set. ORDER BY can only be used in the SELECT operator….

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PostgreSQL INSERT statement.

PostgreSQL INSERT statement is used to insert one or more records into a table in PostgreSQL….

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PostgreSQL UNION ALL statement

PostgreSQL UNION ALL statement is used to combine the resulting sets of 2 or more SELECT operators. It returns all rows from a query and does not dele…

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PostgreSQL INTERSECT statement

PostgreSQL INTERSECT statement returns the intersection of 2 or more data sets. Each data set is defined by the SELECT operator.

If a record exists…

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