Question

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

所有相同字段的名称。

我想将这些表中的所有错误条目(where error != ''）插入到data_error表中，但仅限于特定字段。

如何归档？

Answer 1

如果您想按照表名的某个规则浏览所有表：

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

Answer 2

我想你想做点什么：

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

如果您想在包含所有表的单个查询中执行此操作，则可以执行某些操作

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;

依旧......

Answer 3

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

从多个表中插入？

3 个答案: