CRUD stand for 'Create', 'Read', 'Update' and 'Delete'. Each function of CRUD represents a major function of working with relational database (SQL). SQL is a language made for managing data held for relational databases.
Example:
Create:
INSERT INFO table_name (:key => value);
Read
SELECT colum_name FROM table_name;
Update:
UPDATE table_name SET key = new_value WHERE key = old_value;
Delete:
DELETE FROM table_name WHERE key = old_value
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