The LENGTH function is used for string manipulation on all string data types (BIT, BLOB, and CHARACTER) and returns an integer value giving the number of singletons in source_string.
It If the source_string is NULL, the result is the NULL value. The term singleton refers to a single part (BIT, BYTE, or CHARACTER) within a string of that type.
LENGTH('Hello World!');returns 12.
LENGTH('');returns 0.
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