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How to write a custom function, realize the concat_ws () function is the same function?
Functions are as follows:
The select CONCAT_WS (', ', 'a', 'b', 'c');
A, b, c
The select CONCAT_WS (', ', 'a', ', 'c');
A, and c
The select CONCAT_WS (', ', 'a', null, "c");
A, c
