Illustrate briefly the term SQL sub query
Illustrate briefly the term SQL sub query?
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The SQL sub query is a means of querying two or more than two tables at the same time. The sub query itself is an SQL SELECT statement existed in the WHERE clause of another SQL SELECT statement, and separated through being enclosed in parenthesis. Several sub queries have equivalent SQL join structures; however correlated sub queries can’t be duplicated by a join.
How do I take a known dollar (totalcost) such as $240.00, back out the sales taxes from the known values using the States (VA and WV) sales tax, showing the difference so that I can print an invoice, with the fields Customer name, address, city, state Subtotal, sales tax and totalcost $240.00. All
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