SQL code copied to buffer

Task 14:

Is the index fit for queries?

Is the following index a good fit for both queries?
| CREATE INDEX tbl_idx ON tbl (a, b);

| SELECT * FROM tbl
| WHERE a = 38 AND b = 1;

| SELECT * FROM tbl
| WHERE b = 1;
Source: The 3-Minute SQL Indexing Quiz

Good fit: No need to change anything.

Bad fit: Changing the index or query could improve performance.

Mark all correct answers and click the "Check!" button

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SQL in 10 Minutes a Day by Ben Forta

SQL in 10 Minutes a Day by Ben Forta

Whether you're an application developer, database administrator, web application designer, mobile app developer, or Microsoft Office users, a good working knowledge of SQL is an important part of interacting with databases. And Sams Teach Yourself SQL in 10 Minutes offers the straightforward, practical answers you need to help you do your job.

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