Lesson 14 of 20

Fix a problem with subquery and EXISTS

Break down a question into intermediate results and properly test for the existence of a relationship.

34 minSQL Essentials

By the end of this lesson

  • Write a scalar subquery
  • Use EXISTS for an existence test
  • Choose between join and subquery

SQL Essentials

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Fix a problem with subquery and EXISTS is part of the complete programme: 20 lessons, 44 verifiable exercises and 2 published guided projects.

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