oracle截取字符串
将 C3411.907w15 截取点号之前的字符串 C3411 SUBSTR ('C3411.907w15', 0, INSTR ('C3411.907w15, '.', 1, 1) – 1)
SELECT SUBSTR ('C3411.907w15', 0, INSTR ('C3411.907w15, '.', 1, 1) – 1)
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FROM DUAL
将 C3411.907w15 截取点号之后 的字符串 907w15 SUBSTR ('C3411.907w15', INSTR ('C3411.907w15', '.', 1, 1)+1)
SELECT SUBSTR ('C3411.907w15', INSTR ('C3411.907w15', '.', 1, 1)+1)
FROM DUAL