Army intensifying Stinger air missile training as part of new strategic initiatives; Army takes the lead in virtual health technology with opening of new Texas facility; Army task force fights Boko Haram, terrorism in Cameroon with youth outreach; Army builds sustaining military partnership with Saudi Arabia
This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row.
SQL Aggregate Functions. SQL Aggregate functions return a single value, using values in a table column. In this chapter we are going to introduce a new table called Sales, which will have the following columns and data: The SQL COUNT function returns the number of rows in a table satisfying the criteria specified in the WHERE clause.