我需要从字符串'000-111-222-333'中单独提取'000-111',即Teradata中第二个'-'之前的字符串部分,而无需对位置进行硬编码,因为字符串中的字符数可能会有所不同。预先
Depending on your TD release (or installed UDFs):
SUBSTRING(x FROM 1 FOR INSTR(x,'-',1,2) - 1)
This should work in any TD release:
SUBSTRING(x FROM 1 FOR POSITION('-' IN x) + POSITION('-' IN SUBSTRING(x FROM POSITION('-' IN x) + 1)) - 1)
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