TOLOWER string function to convert uppercase letters to lowercase - MaxCompute

Converts all uppercase letters in a string to lowercase.

Syntax	`string tolower(string <source>)`
Returns	STRING
Example	`tolower('aBcd')` → `'abcd'`

Parameters

Parameter	Required	Type	Description
`source`	Yes	STRING	The string to convert. BIGINT, DOUBLE, DECIMAL, and DATETIME values are implicitly converted to STRING before processing. Only English characters are supported.

Returns a STRING value.

If source is of an unsupported type (not STRING, BIGINT, DOUBLE, DECIMAL, or DATETIME), an error is returned.
If source is null, null is returned.

-- Returns 'abcd'
SELECT tolower('aBcd');

-- Returns 'china fighting'
SELECT tolower('China Fighting');

-- Returns null
SELECT tolower(null);

tolower is a string function. For other string search and conversion functions, see String functions.