错误代码:1172.结果包含多行[MySQL]

问题描述:

这是我第一次在mysql中创建存储过程。错误代码:1172.结果包含多行[MySQL]

它所做的是,

first- get count of all records 

second- loop through that table 1 by 1 

third- compare each entry if it is a duplicate 

fourth- insert duplicate in a temporary table 

last- display duplicates 

它是在100-200项上更大的记录高达500+(有时25K)正常工作,它抛出一个消息

错误代码:1172.结果由多个行组成

我已经使用了这个问题,但没有人(答案)帮我解决我的问题。

请把我的脚本

BEGIN 

DECLARE n INT DEFAULT 0; 
DECLARE i INT DEFAULT 0; 

DECLARE i_sku VARCHAR(255); 
DECLARE i_concatenated_attributes MEDIUMTEXT; 

DECLARE f_sku VARCHAR(255); 
DECLARE f_offer_type VARCHAR(255); 
DECLARE f_name VARCHAR(255); 
DECLARE f_product_owner VARCHAR(255); 
DECLARE f_listing_city VARCHAR(255); 
DECLARE f_listing_area VARCHAR(255); 
DECLARE f_price DOUBLE; 
DECLARE f_bedrooms INT; 
DECLARE f_building_size INT; 
DECLARE f_land_size INT; 
DECLARE f_concatenated_attributes MEDIUMTEXT; 
DECLARE f_duplicate_percentage INT; 

SELECT COUNT(*) FROM unit_temp_listing INTO n; 
CREATE TEMPORARY TABLE IF NOT EXISTS temp_temp (dup_sku VARCHAR(255), dup_percentage INT, attribs MEDIUMTEXT); 
SET i=0; 
WHILE i<n DO 
    -- Get all unit listings (one by one) 
    SELECT 
    sku, concat_ws(',',offer_type,name,product_owner,listing_city,listing_area,price,ifnull(bedrooms,0),ifnull(building_size,0),ifnull(land_size,0)) as concatenated_attributes 
INTO i_sku, i_concatenated_attributes 
FROM unit_temp_listing 
limit 1 offset i; 
-- Compare one by one (sadla) 
SELECT 
    f.sku, f.offer_type, f.name, f.product_owner, f.listing_city, f.listing_area, f.price, f.bedrooms, f.building_size, f.land_size, 
    levenshtein_ratio(concat_ws(',',f.offer_type,f.name,f.product_owner,f.listing_city,f.listing_area,f.price,ifnull(f.bedrooms,0),ifnull(f.building_size,0),ifnull(f.land_size,0)),i_concatenated_attributes) as f_duplicate_percentage, 
    concat_ws(',',f.offer_type,f.name,f.product_owner,f.listing_city,f.listing_area,f.price,ifnull(f.bedrooms,0),ifnull(f.building_size,0),ifnull(f.land_size,0)) as fconcatenated_attributes 
INTO f_sku, f_offer_type, f_name, f_product_owner, f_listing_city, f_listing_area, f_price, f_bedrooms, f_building_size, f_land_size, f_duplicate_percentage, f_concatenated_attributes 
FROM unit_temp_listing f 
WHERE substring(soundex(concat_ws(',',offer_type,name,product_owner,listing_city,listing_area,price,ifnull(bedrooms,0),ifnull(building_size,0),ifnull(land_size,0))),1,10) = substring(soundex(i_concatenated_attributes),1,10) 
    AND levenshtein_ratio(concat_ws(',',offer_type,name,product_owner,listing_city,listing_area,price,ifnull(bedrooms,0),ifnull(building_size,0),ifnull(land_size,0)),i_concatenated_attributes) > 90 
    AND f.sku != i_sku; 
-- INSERT duplicates 
IF(f_sku IS NOT NULL) THEN 
    INSERT INTO temp_temp (dup_sku, dup_percentage, attribs) VALUES (f_sku, f_duplicate_percentage, f_concatenated_attributes); 
    SET f_sku = null; 
    SET f_duplicate_percentage = null; 
    SET f_concatenated_attributes = null; 
END IF; 
SET i = i + 1; 
END WHILE; 
SELECT * FROM temp_temp; 
DROP TABLE temp_temp; 
End 

什么问题看看吗?

你好,我的开发伙伴我已经解决了我的问题,我想在这里分享。

问题是,我的SECONDSELECT语句在WHILE循环内返回多行。我尝试使用CURSOR,但我仍然收到错误消息。于是,我把我的那个第二SELECT声明INSERT语句中这样

INSERT INTO table_name (columns, ...) SELECT_STATEMENT 

,然后,问题解决了!但如果有人有一个想法来优化我的查询请帮助我。我必须处理20k +记录,但由于执行时间过长,我只能在15-20分钟内处理500个记录。

谢谢你的18个意见(在撰写本文时)。

快乐编码!