SQL Certificate – Useful Resources The following resources contain additional information on SQL Certificate. Please use them to get more in-depth knowledge on this topic. Useful Links on SQL Certificate − Database Language SQL (Proposed revised text of DIS 9075) July 1992 (Second Informal Review Draft). − DB2 resource for SQL users. − Oracle SQL […]
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SQL – Using Group functions Reporting Aggregate data using the Group functions SQL has numerous predefined aggregate functions that can be used to write queries to produce exactly this kind of information.The GROUP BY clause specifies how to group rows from a data table when aggregating information, while the HAVING clause filters out rows that […]
SQL – Restricting and Sorting Data The essential capabilities of SELECT statement are Selection, Projection and Joining. Displaying specific columns from a table is known as a project operation. We will now focus on displaying specific rows of output. This is known as a select operation. Specific rows can be selected by adding a WHERE […]