截取‘，’之间的数据，哪里不对吗？
SELECT SUBSTR('I61.900,I61.900,I61.900,I61.900',
1,
INSTR('I61.900,I61.900,I61.900,I61.900', ',', 1, 1) - 1) ONE,
SUBSTR('I61.900,I61.900,I61.900,I61.900',
...
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