Question

我有2个表，调用Table1和Table2。 Table1列是id，name，col3。表2具有列id，名称，col3。我想从Table1中提取所有记录的id和名称（两者都满足条件）不在表2中。怎么做

Answer 1

以下是否有帮助：

SELECT 
    Table1.ID, 
    Table1.name, 
    Table1.col3, 
    Table2.ID
FROM 
    Table2 RIGHT JOIN Table1 ON (Table2.name = Table1.name) AND (Table2.ID = Table1.ID)
WHERE 
    Table2.ID Is Null;

Answer 2

这个怎么样......

SELECT t1.*
FROM Table1 t1
LEFT OUTER JOIN Table2 t2
  ON t1.id = t2.id AND t1.name = t2.name
WHERE t2.id IS NULL

Answer 3

我认为你需要其他表中没有的值（id，name）。

SELECT t1.*
FROM Table1 t1
LEFT JOIN Table2 t2
  ON t1.id <> t2.id AND t1.name <> t2.name
WHERE t2.id is null
UNION
SELECT t2.*
FROM Table2 t2
LEFT JOIN Table1 t1
  ON t1.id <> t2.id AND t1.name <> t2.name
WHERE t1.id is null

sql - 在sql中检查双重条件

3 个答案: