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SQL string functions perform operation on a string input value and return a string or numeric value. The following table list some useful string functions:
| Function | Description |
|---|---|
| CONCAT() | Returns a string by concatenating two or more string values. |
| LOWER() | Converts a string to lowercase. |
| UPPER() | Converts a string to uppercase. |
| SUBSTRING() | Returns a substring from string. |
| REVERSE() | Returns the reverse order of a string value. |
| TRIM() | Remove leading and trailing spaces from a string. |