Question

我有幸运抽奖选项表，其中两种类型的选项是一种是库存数量选项，第二种选择是一般选项

现在我必须在获得随机选项之前检查股票数量

我已经写了如下查询

set @percentage = 100 * rand();

select bkt_lucky_option.*,bkt_lucky_option_stock.option_stock_qty
from bkt_lucky_option LEFT JOIN bkt_lucky_option_stock ON bkt_lucky_option.lucky_option_id = bkt_lucky_option_stock.option_lucky_id
WHERE bkt_lucky_option_stock.option_stock_qty > 0
order by bkt_lucky_option.lucky_option_in_hour <= @percentage, rand()
limit 0, 8

WHERE bkt_lucky_option_stock.option_stock_qty＆gt; 0

对于这种情况，我必须检查 lucky_option_type 是否为1然后才应该应用此条件

Answer 1

WHERE lucky_option_type != 1 OR bkt_lucky_option_stock.option_stock_qty > 0

Answer 2

如果您使用的是SQL Server，请尝试以下查询：

 SET @percentage = 100 * rand();

 SELECT bkt_lucky_option.*,bkt_lucky_option_stock.option_stock_qty
 FROM bkt_lucky_option 
 LEFT JOIN bkt_lucky_option_stock ON bkt_lucky_option.lucky_option_id = 
        bkt_lucky_option_stock.option_lucky_id
 WHERE ( bkt_lucky_option_stock.option_stock_qty > 0 AND lucky_option_type = 
         1 ) OR 
       ( bkt_lucky_option_stock.option_stock_qty = 
         bkt_lucky_option_stock.option_stock_qty AND lucky_option_type <> 1 
       )
 ORDER BY bkt_lucky_option.lucky_option_in_hour <= @percentage, RAND()
 limit 0, 8

我如何在SQL Query中的where条件中放置where来检查qty

2 个答案: