我有一个MySQL查询,我试图在SQLite中运行.我发现IF条件在SQLite中不起作用,应该转换为CASE.由于MySQL查询非常重要,因此我希望有人可以告诉我应该如何完成.在许多其他MySQL查询中,我必须转换为SQLite.
一旦我看到它应该在我使用的查询中完成(因为我熟悉它),我认为我可以为其他人处理它.这是应该在SQLite中运行的MySQL:
select
p.products_model,
pd.products_name,
m.manufacturers_name,
p.products_quantity,
p.products_weight,
p.products_image,
p.products_id,
p.manufacturers_id,
p.products_price,
p.products_tax_class_id,
IF(s.status, s.specials_new_products_price, NULL) as specials_new_products_price,
IF(s.status, s.specials_new_products_price, p.products_price) as final_price
from
products_description pd,
products p
left join manufacturers m on p.manufacturers_id = m.manufacturers_id
left join specials s on p.products_id = s.products_id,
products_to_categories p2c
where
p.products_status = "1" and
p.products_id = p2c.products_id and
pd.products_id = p2c.products_id and
pd.language_id = "1" and
p2c.categories_id = "10"
我经营一个购物车,产品可以有其他选择.例如,product1可以有多个选项,例如:
尺寸:s,m,l,xl
颜色:红色,蓝色,绿色
默认产品存储在customers_basket.
其他选择的项目存储在customers_basket_attributes.
在这两个表中,我插入了一个名为的唯一键products_unique_id.
这是为了识别客户何时添加具有相同选项的另一产品,如果是,我只需要更新customers_basket表的数量字段.
如果用户插入相同的产品但具有不同的选项,则products_unique_id更改.
以下查询不起作用:
SELECT * FROM
customers_basket_attributes cba,
customers_basket cb
WHERE
cba.products_id = cb.products_id
AND
cba.products_unique_id = cb.products_unique_id
AND customers_id="1"
但是,此查询有效:
SELECT * FROM
customers_basket cb,
products p,
products_description pd
WHERE
cb.products_id = p.products_id
AND
cb.products_id = pd.products_id
AND customers_id="1"
这也有效:
SELECT * FROM
customers_basket_attributes cba,
products p,
products_description pd
WHERE
cba.products_id = p.products_id
AND
cba.products_id = pd.products_id
AND customers_id="1"
数据库结构和记录
以下是测试上述查询所需的数据库结构和记录: …