[英]MySQL : IS NOT NULL check on custom generated column(alias)
存储过程到目前为止工作正常,但我只想在 dist_calculated
IS NOT NULL
时才需要记录。 当我在where clause
使用该条件时,它#1054 - Unknown column 'dist_calculated' in 'where clause'
显示错误#1054 - Unknown column 'dist_calculated' in 'where clause'
。 Witout where子句运行良好并返回NULL记录,如:
entity_id dist_calculated
49 NULL
50 NULL
52 4460.615
51 4875.179
我想排除NULL。
我试过WHERE dist_calculated IS NOT NULL
和WHERE cpe.dist_calculated IS NOT NULL
仍然给出错误。
我的存储过程是:
DELIMITER //
CREATE PROCEDURE get_close_childcares(IN latUser DECIMAL(15,6),IN lngUser DECIMAL(15,6) )
BEGIN
/*Get 4 ids of closest childcares*/
/*Outer query
@param : userLat, userLng, Current childcare lat,current childcare lng
Note : Inner query returns lat , lng of Current product 176 : lat , 177: lng
*/
SELECT cpe.entity_id , get_distance_in_miles_between_geo_locations(latUser,lngUser,
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 176)
),
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 177)
)
) AS dist_calculated
FROM catalog_product_entity AS cpe
WHERE dist_calculated IS NOT NULL
ORDER BY dist_calculated ASC
LIMIT 0,4;
END
//
DELIMITER ;
并调用存储过程:
call get_close_childcares(19.992100,73.777000)
谢谢。
MySQL允许在GROUP BY和HAVING上使用列别名,但不允许在WHERE语句中使用。 因此,您需要在WHERE中使用完整定义,例如
SELECT cpe.entity_id , get_distance_in_miles_between_geo_locations(latUser,lngUser,
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 176)
),
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 177)
)
) AS dist_calculated
FROM catalog_product_entity AS cpe
WHERE
get_distance_in_miles_between_geo_locations(latUser,lngUser,
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 176)
),
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 177)
)
) IS NOT NULL
ORDER BY dist_calculated ASC
LIMIT 0,4;
你可以尝试这个伴侣:
SELECT
cpe.entity_id,
get_distance_in_miles_between_geo_locations (
latUser,
lngUser,
cpev_1.`value`,
cpev_2.`value`
) AS dist_calculated
FROM
catalog_product_entity cpe
INNER JOIN catalog_product_entity_varchar cpev_1 ON cpev_1.entity_id = cpe.entity_id
AND cpev_1.attribute_id = 176
INNER JOIN catalog_product_entity_varchar cpev_2 ON cpev_2.entity_id = cpev.entity_id
AND cpev_2.attribute_id = 177
ORDER BY
dist_calculated ASC
LIMIT 0,4;
请试试
CREATE PROCEDURE get_close_childcares(IN latUser DECIMAL(15,6),IN lngUser DECIMAL(15,6) )
BEGIN
/*Get 4 ids of closest childcares*/
/*Outer query
@param : userLat, userLng, Current childcare lat,current childcare lng
Note : Inner query returns lat , lng of Current product 176 : lat , 177: lng
*/
SELECT cpe.entity_id , get_distance_in_miles_between_geo_locations(latUser,lngUser,
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 176)
),
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 177)
)
) AS dist_calculated
FROM catalog_product_entity AS cpe
WHERE get_distance_in_miles_between_geo_locations(latUser,lngUser,
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 176)
),
(SELECT cpev.value FROM catalog_product_entity_varchar AS cpev
WHERE (cpev.entity_id = cpe.entity_id AND cpev.attribute_id = 177)
)
) IS NOT NULL
ORDER BY dist_calculated ASC
LIMIT 0,4;
END
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