MySQL"IS IN"等价吗？

Question

前一段时间我参与了一个MS-SQL项目,我记得一个"IS IN"的东西.我在MySQL项目上尝试过它并没有用.

有同等的吗？解决方法？

这是我试图运行的完整查询:

SELECT *
FROM product_product, product_viewhistory, product_xref
WHERE 
(
(product_viewhistory.productId = product_xref.product_id_1 AND product_xref.product_id_2 = product_product.id)
OR 
(product_viewhistory.productId = product_xref.product_id_2 AND product_xref.product_id_1 = product_product.id)
)
AND product_product.id IS IN 
    (SELECT DISTINCT pvh.productId
    FROM product_viewhistory AS pvh
    WHERE pvh.cookieId = :cookieId
    ORDER BY pvh.viewTime DESC
    LIMIT 10)
AND product_viewhistory.cookieId = :cookieId
AND product_product.outofstock='N'
ORDER BY product_xref.hits DESC
LIMIT 10

它很大......但我感兴趣的部分是:

AND product_product.id IS IN 
    (SELECT DISTINCT pvh.productId
    FROM product_viewhistory AS pvh
    WHERE pvh.cookieId = :cookieId
    ORDER BY pvh.viewTime DESC
    LIMIT 10)

这基本上说我希望产品在该子查询的"前10名"中.

你如何用MySQL实现这一目标(同时努力提高效率)？

Answer 1

您正在寻找IN:

AND product_product.id IN 
    (SELECT DISTINCT pvh.productId
    FROM product_viewhistory AS pvh
    WHERE pvh.cookieId = :cookieId
    ORDER BY pvh.viewTime DESC
    LIMIT 10)