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EXISTS Command

If you simply need to check whether a key exists in Redis without retrieving its value, you can use the EXISTS command.

Example Usage

If you provide a single key, the result will be 1 if the key exists, or 0 if it does not.

In this case, the result will be 1 since the key mykey exists.

When multiple keys are specified, the command will return the number of keys that exist in Redis. If we also have keys key1 and key3 in the database, this query will return 2, since only key1 and key3 exist in the database.

question mark

What will the EXISTS command return when checking multiple keys?

Select the correct answer

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bookEXISTS Command

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EXISTS Command

If you simply need to check whether a key exists in Redis without retrieving its value, you can use the EXISTS command.

Example Usage

If you provide a single key, the result will be 1 if the key exists, or 0 if it does not.

In this case, the result will be 1 since the key mykey exists.

When multiple keys are specified, the command will return the number of keys that exist in Redis. If we also have keys key1 and key3 in the database, this query will return 2, since only key1 and key3 exist in the database.

question mark

What will the EXISTS command return when checking multiple keys?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 3
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