CONCAT_WS(separator,string1[,string2,...])
Description: Concatenates all strings together in the order specified, with separator given by separator, and returns the resulting string.
Numeric arguments are converted to strings. Any NULL string is skipped. A NULL separator causes a NULL to be returned.
Examples:
CONCAT_WS('+','a','2','z') returns a+2+z.
CONCAT_WS('/',14,5,2000) returns 14/5/2000.
CONCAT_WS(NULL,'a','b') returns NULL.
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