HDEL command in Redis is used to delete one or more fields from a hash stored at a key. It's commonly used when you need to remove specific data points from a large dataset stored in a Redis Hash.
Here's a simple example using the
redis-py library in Python:
In this example, we first create a connection to the local Redis server. Then, a hash with key
user:1000 is created with three fields - 'name', 'age', and 'email'. The
hdel command is used to delete the 'email' field from our hash. The remaining fields are then printed to the console.
1. What if the field does not exist in the hash?
If the specified field does not exist in the hash or the key does not exist,
HDEL will simply ignore it and return 0.
2. Can I delete multiple fields at once?
HDEL supports deletion of multiple fields at once. Just pass the fields as additional arguments:
r.hdel('user:1000', 'field1', 'field2', ...).