如何提高基于字符串的查询联接的性能？
[英]How to improve performance of the query joining on string basis?
问题描述
I have two table 
我有两个桌子
-
orderTableorder表 -
marketplace_paymentTablemarketplace_payment表
An order table contain a field marketplace_ref_no Having Type varchar(24) Collation utf_general_ci 一个order表包含一个字段marketplace_ref_no有类型varchar(24)整理utf_general_ci
A marketplace_payment Table contains this field with same name marketplace_ref_no Having Type varchar(24) Collation utf_general_ci marketplace_payment表包含具有相同名称marketplace_ref_no此字段，其类型为varchar(24)归类utf_general_ci
However When I am trying to join both the tables, It is taking 2 minutes 48 second to execute. 但是，当我尝试同时连接两个表时，执行此操作需要2分48秒。 What are the measures should i take? 我应该采取什么措施？
1 个解决方案
解决方案1
0 已采纳 2015-10-17 11:03:53
You might consider indexing the columns. 您可以考虑为列建立索引。 This will have the effect of reducing the number of rows that must be searched. 这样可以减少必须搜索的行数。 Read more here 在这里阅读更多
https://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html https://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html
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