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PostgreSQL trunc function.

PostgreSQL trunc function returns a number truncated to a certain number of decimal places….

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PostgreSQL sum function.

PostgreSQL sum function returns the cumulative value of the expression….

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PostgreSQL WHERE statement.

PostgreSQL WHERE statement is used to filter results from SELECT, INSERT, UPDATE, or DELETE statement….

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PostgreSQL GROUP BY statement.

PostgreSQL GROUP BY statement is used in the SELECT statement to collect data on several records and group results by one or more columns….

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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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