在 MySQL 过程中添加一个新的编号列

Question

我想在 MySQL 中创建一个存储过程，它显示 table 的数据，其中包含行号而不是行的 ID。像这样：

我试过这段代码：

CREATE DEFINER=`root`@`localhost` PROCEDURE `count_row`()
BEGIN
declare row_num INTEGER;
declare result INTEGER;
SELECT count(id) FROM engineers INTO row_num;
SET result=0;
WHILE(result<=row_num)
DO
SELECT result=result+1, name, date FROM engineers ;
END WHILE;
END

结果是在 MySQL 中创建了未定义数量的选项卡。然后我尝试了这段代码：

CREATE DEFINER=`root`@`localhost` PROCEDURE `count_row`()
BEGIN
declare row_num INTEGER;
declare result INTEGER;
SELECT count(id) FROM engineers INTO row_num;
SET result=1;
WHILE(result<=row_num)
DO
SELECT result, name, date FROM engineers;
SET result = result +1;
END WHILE;
END

我得到了 5 个标签（等于总行数），如下所示：

第二个标签：

我想要的是只显示一个带有一个 table 的选项卡，如问题的第一张图片所示。

Answer 1

尝试

SELECT @row_number:=@row_number+1 as RowNum, name as Engineer, date
FROM engineers, (SELECT @row_number:=0) as t
order by name;

或

SET @row_number:=0;
SELECT @row_number:=@row_number+1 as RowNum, name as Engineer, date
FROM engineers
order by name;

在 MySQL 过程中添加一个新的编号列

Adding a new column for numbering in MySQL procedure

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