从多个表插入？

Question

我有以下表格：data_1,data_1,data_3,data_4，（data_ *）。

所有人都有相同的字段名称。

我想将这些表中的所有错误条目(where error != ''）插入到data_error表中，但只有特定的字段。

如何归档？

Answer 1

我想你想要做的事，如：

insert into table (fields) 
    select field from data_1 
    where error <> 1; 

如果你想做到这一点在所有表单查询，你可以做一些

insert into table (fields) 
    select field from data_1 
    where error <> 1 
    UNION 
    select field from data_2 
    where error <> 1 
    UNION 
    select field from data_3 
    where error <> 1; 

等。 。

Answer 2

INSERT INTO data_error (column1, column2, column3) 
SELECT column1, column2, column3 
FROM data_1 
WHERE error != '' 
UNION ALL 
SELECT column1, column2, column3 
FROM data_2 
WHERE error != '' 
UNION ALL 
SELECT column1, column2, column3 
FROM data_3 
WHERE error != '' 
UNION ALL 
SELECT column1, column2, column3 
FROM data_4 
WHERE error != '' 

MySQL Ref

Answer 3

如果你想通过所有表如下表名一定的规则：

CREATE DEFINER=`root`@`localhost` PROCEDURE `TEST_TABLE_LOOP`() 
BEGIN 
    DECLARE data_TableName VARCHAR(50) DEFAULT ''; 
    DECLARE is_Done INT DEFAULT FALSE; 

    DECLARE insert_MainCursor CURSOR FOR SELECT table_name FROM information_schema.tables WHERE table_name LIKE '<FILTER GOES HERE>'; 

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET is_Done = TRUE; 

    OPEN insert_MainCursor; 

    read_loop:LOOP 
     FETCH insert_MainCursor INTO data_TableName; 

     IF is_Done THEN 
      LEAVE read_loop; 
     END IF; 

     SET @sql = CONCAT('INSERT INTO <DESTINATION_TABLE_NAME_HERE> SELECT <COLUMN1>, <COLUMN2> FROM ', data_TableName, ' WHERE <SOMETHING_SOMETHING_GOES_HERE>'); 
     PREPARE stmt FROM @sql; 
     EXECUTE stmt; 
     DEALLOCATE PREPARE stmt; 

    END LOOP read_loop; 

    CLOSE insert_MainCursor; 
END