Question

INSERT INTO `dictionary2` (word,verb)
SELECT SUBSTRING(word FROM 2)
FROM `dictionary1`
WHERE `dictionary1`.word LIKE "w%"

我有两个表，dictionary1（word）和dictionary2（word，动词）。

我想在dictionary2中插入来自dictionary1的值，其中word以'w'开头，而该值不存在于dictionary2.word中。
在同一个插页中，我想将dictionary2.verb的值设置为1。

Answer 1

你可以用这个：

INSERT INTO dictionary2 (word, verb)
SELECT dictionary1.word, 1
FROM
  dictionary1 LEFT JOIN dictionary2
  ON dictionary1.word = dictionary2.word
WHERE
  dictionary1.word LIKE 'w%'
  AND dictionary2.word IS NULL

请参阅小提琴here。

Answer 2

试试这个：

SQL查询：

INSERT INTO `dictionary2` (word,verb)
SELECT word, (select @number :=1)
FROM `dictionary1`
WHERE `dictionary1`.word LIKE "t%"
AND `dictionary1`.word NOT IN(SELECT word FROM dictionary2);

示例数据：

CREATE TABLE `dictionary2` (
ID INT AUTO_INCREMENT PRIMARY KEY,
word VARCHAR (50),
verb VARCHAR (50)
);

CREATE TABLE `dictionary1` (
ID INT AUTO_INCREMENT PRIMARY KEY,
word VARCHAR (50)
);

INSERT INTO `dictionary2`(word,verb) 
VALUES
('test','test'),
('test1','test1'); 
INSERT INTO `dictionary1`(word) VALUES('test'),('testing1');

B.T.W。您可以安全地将LIKE "t%"更改为LIKE "w%"; - ）

SQL FIDDLE DEMO

MYSQL从table1将数据插入table2，前提是table1.value1不等于table2.value1

2 个答案: