UPDATE USER INFO SET C_DOMAIN_ACC = SUBSTR(EMAIL_,O,INSTR('@',EMAIL_)) WHERE EMAIL_ IS NOT NULL AND C_DOMAIN_ACC_ IS NULL;
SUBSTR截取,INSTR下标
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UPDATE USER INFO SET C_DOMAIN_ACC = SUBSTR(EMAIL_,O,INSTR('@',EMAIL_)) WHERE EMAIL_ IS NOT NULL AND C_DOMAIN_ACC_ IS NULL;
SUBSTR截取,INSTR下标