How sql separates data from both sides with arbitrary symbols

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Separate the data on both sides with any symbol

For example, if we split the data with a comma (,), we would have the following data

It is divided into the following figure:

SELECT Rmaine case WHEN CHARINDEX (',', R) > 1 THEN LEFT (RMagna CHARINDEX (',', R)-1) ELSE NULL END AS R1, CASE WHEN CHARINDEX (',', R) > 1 THEN RIGHT (R, (LEN (R)-CHARINDEX (',', R) ELSE NULL END AS R2FROM t

The code is long, so we split the code to understand:

SELECT CHARINDEX (',')-- the result is 1SELECT CHARINDEX (',', 'NULL')-- the result is 0SELECT CHARINDEX (',',')-- the result is 0SELECT CHARINDEX (',','A,')-- the result is 2SELECT LEN ('A,')-- the result is 3SELECT LEN ('A,')-CHARINDEX (',','A')-- the result is 3-2=1SELECT RIGHT ('A,',') B')-CHARINDEX (',','A _ MagneB'))-- the result is B.

In the last step, we split the'A ~ ~ B 'out of B, and we can get it in a similar way.

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