mysql - inserting records in a MySQL table depending on existing values in another table

Question

I am using MySQL. I want to insert some records in a table provided that they do not exist in another table. So I want to perform something like this:

INSERT INTO sales (name, id)
SELECT name, id FROM sales_h 
WHERE name AND id NOT IN (SELECT name, id FROM T_sales);

The problem is that MySQL does not allow this kind of syntax (something to do with the where clause...) I tried using CONCAT but with no result.

Any clue??

Answer 1

INSERT
INTO    sales (name, id)
SELECT  name, id
FROM    sales_h
WHERE  (name, id) NOT IN
       (
       SELECT name, id
       FROM t_sales
       )

Answer 2

您是否尝试过EXISTS 语法？

INSERT INTO sales (name, id) 
SELECT name, id 
FROM sales_h 
WHERE NOT EXISTS (SELECT * FROM T_sales WHERE T_sales.name = sales_h.name AND T_sales.id = sales_h.id);

Answer 3

MySQL 允许您像变量一样使用元组：

这是你的声明：

INSERT INTO sales (name, id)
SELECT name, id FROM sales_h 
WHERE name AND id NOT IN (SELECT name, id FROM T_sales);

问题是“姓名和身份证”。把它变成一个元组：

INSERT INTO sales (name, id)
SELECT name, id FROM sales_h 
WHERE (name, id) NOT IN (SELECT name, id FROM T_sales);

就个人而言，我不太喜欢这个有两个原因：元组作为变量在其他 RDBMS 上不起作用（或工作方式不同），并且 IN 在许多情况下往往表现不佳，所以我喜欢养成不做的习惯用于。

正如 jhonny-d-cano-leftware 所说（我已经升级了他），我会使用 where not exists ：

INSERT INTO sales (name, id)
SELECT name, id FROM sales_h a
WHERE not exists (
 SELECT * 
 FROM T_sales b 
 where b.id = a.id and b.name = a.name);

Answer 4

您可能会查看ON DUPLICATEMySql 的子句

http://dev.mysql.com/doc/refman/5.1/en/insert-select.html

Answer 5

你不能说 WHERE name AND id NOT IN... 你需要为每个单独的子句。但是你有 id 作为表 T_sales 中的主键吗？如果是这样，那么这就是您需要检查的所有内容，例如：

INSERT INTO sales (name, id) 
(SELECT name, id FROM sales_h WHERE id NOT IN (SELECT id FROM T_sales));

编辑

嗯，从其他人的回答来看，最好忽略我，因为他们似乎知道更多:-)

Answer 6

问题是你的 WHERE。

它不像你那样阅读。您将其读作“WHERE (name and id) NOT IN (...)”，而将其读作“WHERE name (isn't null) AND (id NOT IN (...))”.. . 如果你明白我的意思。

改成这样：ROW(name, id) NOT IN (SELECT name, id FROM T_sales);

Answer 7

INSERT INTO table_name(column1, column2) SELECT "value one", "value two" FROM DUAL
WHERE NOT EXISTS(
    SELECT column1 FROM table_name
    WHERE column1 = "value one"
    AND column2 = "value two" LIMIT 1
)