This document discusses subqueries, including: defining subqueries and the types of problems they can solve; listing the types of subqueries; and guidelines for writing single-row and multiple-row subqueries. It covers using subqueries with group functions, the HAVING clause, ALL/ANY operators, and handling null values in subqueries. The overall goal is to teach how to use subqueries to solve queries based on unknown criteria or values that exist in one data set but not another.
After completing this lesson, you should be able to
do the following:
Describe the types of problem that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
http://phpexecutor.com
After completing this lesson, you should be able to do the following:
Describe the types of problems that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
After completing this lesson, you should be able to
do the following:
Describe the types of problem that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
http://phpexecutor.com
After completing this lesson, you should be able to do the following:
Describe the types of problems that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
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