我对SQL语句相当陌生,我试图打印从数据库中出售的单元。在出售单位栏下,它不会打印它将只打印“已售出单位”的号码。任何帮助将不胜感激。 这里是我的代码:SQL Row没有打印正确的值
SELECT brand_name, brand_type, Round(avgprice,2) AS "Average Price", "Units Sold"
FROM lgbrand b
JOIN (
SELECT brand_id, Avg(prod_price) AS avgprice
FROM lgproduct
GROUP BY brand_id
) sub1 ON b.brand_id = sub1.brand_id
JOIN (
SELECT brand_id, Sum(line_qty) AS "Units Sold"
FROM lgproduct p
JOIN lgline l ON p.prod_sku = l.prod_sku
GROUP BY brand_id
) sub2 ON b.brand_id = sub2.brand_id
ORDER BY brand_name;
的可能的复制[当使用单引号,双引号,反引号和在MySQL(http://stackoverflow.com/questions/11321491 /何时使用单引号双引号和反引号在mysql) –