SQL 查询优化转换答案

【问题标题】：SQL Query optimization convertSQL 查询优化转换
【发布时间】：2015-09-13 05:26:52
【问题描述】：

我试图优化（转换）这个 SQL 查询

SELECT DISTINCT c.id, c.couponid, c.branchid, c.chainid
                FROM `users_roles` a, `field_data_field_ypefthinos` b, `custom_redemptions` c, `field_data_field_chain_manager` e, `field_data_field_node_tax_inception` f, `field_data_field_brand_manager` j, `field_data_field_brand_node_ref` k, `field_data_field_product_ref` i, `field_data_field_company_manager` z, `field_data_field_brand_company` t
                WHERE
                (a.rid = 4
                AND a.uid = ?
                AND b.field_ypefthinos_uid = a.uid
                AND b.entity_id = c.branchid)

到：

SELECT DISTINCT c.id, c.couponid, c.branchid, c.chainid
    FROM `custom_redemptions` AS c
INNER JOIN `field_data_field_ypefthinos` as b
    ON b.entity_id = c.branchid
INNER JOIN `users_roles` as A
    ON b.field_ypefthinos_uid = a.uid
    WHERE a.rid 4 AND a.uid 351

但它给了我语法错误

对于原始问题，请查看SQL Query optimization - exec time

【问题讨论】：

WHERE a.rid = 4 AND a.uid = 351
field_data_field_node_tax_inceptionf 跟什么有什么关系？

标签： php mysql sql optimization

【解决方案1】：

你忘了你= 登录WHERE 子句：

 SELECT DISTINCT c.id, c.couponid, c.branchid, c.chainid
        FROM `custom_redemptions` AS c
    INNER JOIN `field_data_field_ypefthinos` as b
        ON b.entity_id = c.branchid
    INNER JOIN `users_roles` as A
        ON b.field_ypefthinos_uid = a.uid
        WHERE a.rid = 4 AND a.uid = 351

希望这会有所帮助。

【讨论】：