sql - 如果列值不存在于该列中，则查询以插入列值
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时间：2020-09-01 04:42:36 来源:igfitidea点击:
sql - query to insert a column value if it does not exist in that column
提问by sangeetha
sql - query to insert a column value if it does not exist in that column
sql - 如果列值不存在于该列中，则查询以插入列值
回答by Jonas Lincoln
Hm. Do you want a new row? In that case,
嗯。你想要一个新的行吗？在这种情况下，
IF NOT EXISTS(SELECT 1 FROM emp WHERE fruits = 'mango')
INSERT INTO emp (fruits) VALUES ('mango')
回答by valli
Two ways to do
两种做法
1.IF NOT EXISTS (SELECT fruit FROM emp WHERE fruit='mango')
BEGIN
INSERT INTO emp(fruit) Values('mango');
END
2.INSERT INTO emp ('mango') SELECT distinct fruit FROM emp WHERE not exists (select fruit from emp as e Where emp.fruit = e.fruit);