SQL – Using DDL Statements Using DDL Statements to Create and Manage Tables A schema is the collection of multiple database objects,which are known as schema objects.These objects have direct access by their owner schema.Below table lists the schema objects. Table – to store data View – to project data in a desired format from […]
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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 […]