SQLite 面试题与答案
Test your skills through the online practice test: SQLite Quiz Online Practice Test
问题 21. How to perform a JOIN operation in SQLite?
To perform a JOIN operation in SQLite, you can use the JOIN keyword in your SELECT statement, specifying the tables and the join condition.
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问题 22. What is the purpose of the GROUP BY clause in SQLite?
The GROUP BY clause in SQLite is used to group rows that have the same values in specified columns into summary rows, like those returned by aggregate functions.
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问题 23. Explain the use of the IN operator in SQLite.
The IN operator in SQLite is used to specify multiple values in a WHERE clause, allowing you to filter results based on a list of values.
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问题 24. What is the purpose of the PRAGMA statement in SQLite?
The PRAGMA statement in SQLite is used to query or change the operational parameters of the SQLite database engine.
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问题 25. How to create an index on a column in SQLite?
You can create an index on a column in SQLite using the CREATE INDEX statement: `CREATE INDEX index_name ON table_name(column_name);`.
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