mysql - 对所有表执行查询并在新表中填写数据

我需要获取带有字段的结果表
-table_name，min_date，max_date

这是我的查询，应该对所有表执行

SELECT MIN(short_date) as FirstDuplicatedDate, MAX(short_date) as LastDuplicatedDate
FROM (SELECT  short_date, type, value,  count(*) as cnt
FROM testTable
GROUP BY  short_date
HAVING COUNT(*) > 1) as Duplicates

然后我发现了如何获取所有表名
我是这样做的

SELECT TABLE_NAME as name FROM `information_schema`.`TABLES`
WHERE `TABLES`.`TABLE_SCHEMA` = 'test'
AND `TABLES`.`TABLE_NAME` LIKE 'test%'

但是我不知道如何对所有表执行它，并将结果填写到新表中。

我试图以这种方式做到这一点

DECLARE @DB_Name varchar(50)
DECLARE @Command varchar(100);
DECLARE database_cursor CURSOR FOR
SELECT name
FROM (SELECT TABLE_NAME as name FROM `information_schema`.`TABLES`
WHERE `TABLES`.`TABLE_SCHEMA` = 'test'
AND `TABLES`.`TABLE_NAME` LIKE 'test%') as TableNames

OPEN database_cursor

FETCH NEXT FROM database_cursor INTO @DB_Name

WHILE @@FETCH_STATUS = 0
BEGIN
     SELECT @Command = 'SELECT MIN(short_date) as FirstDuplicatedDate, MAX(short_date) as LastDuplicatedDate
FROM (SELECT  short_date, type, value,  count(*) as cnt
FROM ' + @DB_Name + '
WHERE type = ''test''
GROUP BY  short_date, type, value
HAVING COUNT(*) > 1) as Duplicates'
     EXEC sp_executesql @Command

     FETCH NEXT FROM database_cursor INTO @DB_Name
END

CLOSE database_cursor
DEALLOCATE database_cursor

但是我得到了这个错误



UPD

CREATE PROCEDURE GetData()
BEGIN

DECLARE @DB_Name varchar(50), @Command varchar(100);
DECLARE database_cursor CURSOR FOR
SELECT name
FROM (SELECT TABLE_NAME as name FROM `information_schema`.`TABLES`
WHERE `TABLES`.`TABLE_SCHEMA` = 'test'
AND `TABLES`.`TABLE_NAME` LIKE 'test%_') as TableNames

OPEN database_cursor

FETCH NEXT FROM database_cursor INTO @DB_Name

WHILE @@FETCH_STATUS = 0
BEGIN
     SELECT @Command = 'SELECT MIN(short_date) as FirstDuplicatedDate, MAX(short_date) as LastDuplicatedDate
FROM (SELECT  short_date, type, value,  count(*) as cnt
FROM ' + @DB_Name + '
WHERE type = ''test''
GROUP BY  short_date, type, value
HAVING COUNT(*) > 1) as Duplicates'
     EXEC sp_executesql @Command

     FETCH NEXT FROM database_cursor INTO @DB_Name
END;

CLOSE database_cursor
DEALLOCATE database_cursor

END;

CALL GetData()

最佳答案

在开始处添加DELIMITER $$；在DELIMITER ;之后添加END。

摆脱声明Command的麻烦。而是使用@command，无需声明。

在SELECT @command;之后添加SELECT @command := ...;，以便我们可以进行一些调试。
CLOSE和DEALLOCATE语句需要;才能终止它们。

测试FETCH的行是否用完。

您确实需要查看许多存储过程的示例，尤其是带有游标的示例。

更新

gh，我什至没有发现语法错误的一半。这可能有用(我不知道是因为我没有您的特定表或列。):

DROP PROCEDURE IF EXISTS so42856538;

DELIMITER $$

CREATE PROCEDURE so42856538()
    LANGUAGE SQL
    MODIFIES SQL DATA
    SQL SECURITY INVOKER
BEGIN

DECLARE _TableName varchar(64);
DECLARE _done INT DEFAULT FALSE;
DECLARE database_cursor CURSOR FOR
    SELECT TABLE_NAME
        FROM `information_schema`.`TABLES`
        WHERE `TABLE_SCHEMA` = 'test'
          AND `TABLE_NAME` LIKE 'test%';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET _done = TRUE;

OPEN database_cursor;
curs_loop: LOOP
    FETCH NEXT FROM database_cursor INTO _TableName;
    IF _done THEN  LEAVE curs_loop;  END IF;
    SET @Command := CONCAT(
           'SELECT MIN(short_date) as FirstDuplicatedDate,
                           MAX(short_date) as LastDuplicatedDate
           FROM ( SELECT  short_date, type, value,  count(*) as cnt
                    FROM ', _TableName, '
                    WHERE type = "test"
                    GROUP BY  short_date, type, value
                    HAVING COUNT(*) > 1 ) as Duplicates'
                        );
    SELECT _TableName, @command;   -- Debugging (remove if it is clutter)
    PREPARE _sql FROM @command;
    EXECUTE _sql;
    DEALLOCATE PREPARE _sql;
END LOOP;
CLOSE database_cursor;

END $$

DELIMITER ;

CALL so42856538;