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REPEAT(str, count)
REPEAT() returns the string of str after repeating for count times. When count is less than or equal to 0, an empty string is returned. If any argument is NULL, the function returns NULL.
obclient> SELECT
REPEAT('1', -1)
REPEAT(null, null)
REPEAT('Abc', 4)
\G
*************************** 1. row ***************************
REPEAT('1', -1):
REPEAT(null, null): NULL
REPEAT('Abc', 4): AbcAbcAbcAbc
1 row in set