Question

当我单独运行时，带有内部联接子查询的select查询会起作用，但会在存储过程的上下文中导致错误Unknown column 'cities.state' in 'on clause'。什么可能导致通常在存储过程中打破的查询？为什么会为cities.state而不是cities.name返回此未知列错误？ MySQL 5.7

CREATE DEFINER=`root`@`localhost` PROCEDURE `geogen`(IN State CHAR(2), CityMin INT(5), CityMax INT(6))
BEGIN

#Create a temporary table to hold the final GeoArea product
DROP TABLE IF EXISTS `geodb`.`geoareas`;
CREATE TEMPORARY TABLE `geodb`.`geoareas` LIKE `geodb`.`geoareatemplate`;

INSERT INTO `geodb`.`geoareas` (`geoarea`, `zip`, `state`)
# Zip code sets of cities/towns with a population between CityMin and CityMax are their own GeoAreas.
SELECT CONCAT(`uszipcode`.`name`, ' ', `uszipcode`.`state`) as 'geoarea', `uszipcode`.`zip`, `uszipcode`.`state`
FROM `geodb`.`uszipcode`
INNER JOIN
(SELECT `name`, `state`, SUM(`population`) AS 'Population'
FROM `geodb`.`uszipcode`
WHERE `uszipcode`.`state` = State
GROUP BY `name`
HAVING (SUM(`population`) >= CityMin AND SUM(`population`) <= CityMax)) as `cities`
ON `uszipcode`.`name` = `cities`.`name`
AND `uszipcode`.`state` = `cities`.`state`
ORDER BY `uszipcode`.`name`, `uszipcode`.`zip`;

SELECT * FROM geodb.geoareas;
END

当我使用

运行此查询时

CALL geogen('TX', 35000, 70000);

我收到错误

0   76  13:10:22    CALL geogen('TX', 35000, 70000) Error Code: 1054. Unknown column 'cities.state' in 'on clause'  0.031 sec

但是，当我自己运行查询时，会返回结果。

SELECT CONCAT(`uszipcode`.`name`, ' ', `uszipcode`.`state`) as 'geoarea', `uszipcode`.`zip`, `uszipcode`.`state`
FROM `geodb`.`uszipcode`
INNER JOIN
(SELECT `name`, `state`, SUM(`population`) AS 'Population'
FROM `geodb`.`uszipcode`
WHERE `uszipcode`.`state` = 'TX'
GROUP BY `name`
HAVING (SUM(`population`) >= 30000 AND SUM(`population`) <= 70000)) as `cities`
ON `uszipcode`.`name` = `cities`.`name`
AND `uszipcode`.`state` = `cities`.`state`
ORDER BY `uszipcode`.`name`, `uszipcode`.`zip`;

结果

LIMIT 0, 1000   121 row(s) returned 0.453 sec / 0.000 sec

Answer 1

MySQL很困惑，因为名为State的参数/变量与列名cities.state类似。我相信这是一个MySQL错误，因为我使用反引号并通过在表名前面添加显式引用该列，但如果我错了请纠正我，这是预期的行为。当我将State参数更新为VarState时，存储过程的结果与独立查询的结果相匹配，如下所示。

CREATE DEFINER=`root`@`localhost` PROCEDURE `geogen`(IN VarState CHAR(2), CityMin INT(5), CityMax INT(6))
BEGIN

#Create a temporary table to hold the final GeoArea product
DROP TABLE IF EXISTS `geodb`.`geoareas`;
CREATE TEMPORARY TABLE `geodb`.`geoareas` LIKE `geodb`.`geoareatemplate`;

# Zip code sets of cities/towns with a population between CityMin and CityMax are their own GeoAreas.
INSERT INTO `geodb`.`geoareas` (`geoarea`, `zip`, `state`)
SELECT CONCAT(`uszipcode`.`name`, ' ', `uszipcode`.`state`) as 'geoarea', `uszipcode`.`zip`, `uszipcode`.`state`
FROM `geodb`.`uszipcode`
INNER JOIN
(SELECT `name`, `state`, SUM(`population`) AS 'Population'
FROM `geodb`.`uszipcode`
WHERE `uszipcode`.`state` = VarState
GROUP BY `name`
HAVING (SUM(`population`) >= CityMin AND SUM(`population`) <= CityMax)) AS `cities`
ON `uszipcode`.`name` = `cities`.`name`
AND `uszipcode`.`state` = `cities`.`state`
ORDER BY `uszipcode`.`name`, `uszipcode`.`zip`;

SELECT * FROM geodb.geoareas
ORDER BY `geoarea`, `zip`;
END

Answer 2

尝试将applySignals包裹在SELECT中，如下所示：

()

Answer 3

试试这个：

 DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `geogen`(IN State CHAR(2), CityMin INT(5), CityMax INT(6))
BEGIN

#temp cities
DROP TABLE IF EXISTS `geodb`.`cities_temp`;
CREATE TEMPORARY TABLE `geodb`.`cities_temp`
SELECT `name`, `state`, SUM(`population`) AS 'Population'
FROM `geodb`.`uszipcode`
WHERE `uszipcode`.`state` = State
GROUP BY `name`
HAVING (SUM(`population`) >= CityMin AND SUM(`population`) <= CityMax) ;
#Create a temporary table to hold the final GeoArea product
DROP TABLE IF EXISTS `geodb`.`geoareas`;
CREATE TEMPORARY TABLE `geodb`.`geoareas` LIKE `geodb`.`geoareatemplate`;

INSERT INTO `geodb`.`geoareas` (`geoarea`, `zip`, `state`)
# Zip code sets of cities/towns with a population between CityMin and CityMax are their own GeoAreas.
SELECT CONCAT(`uszipcode`.`name`, ' ', `uszipcode`.`state`) as 'geoarea', `uszipcode`.`zip`, `uszipcode`.`state`
FROM `geodb`.`uszipcode`
INNER JOIN
`geodb`.`cities_temp` as `cities`
ON `uszipcode`.`name` = `cities`.`name`
AND `uszipcode`.`state` = `cities`.`state`
ORDER BY `uszipcode`.`name`, `uszipcode`.`zip`;

SELECT * FROM geodb.geoareas;
END$$

DELIMITER ;

SQL查询单独工作，但在存储过程中与on子句中的“未知列”断开

3 个答案: