MySQL LIKE与LOCATE
问题描述：
有人知道哪个更快吗?
SELECT * FROM table WHERE column LIKE '%text%';
或
SELECT * FROM table WHERE LOCATE('text',column)>0;
答
添加于2015年4月20日:请另阅读 Hallie的答案下方
Added April 20th, 2015: Please read also Hallie's answer below
第一个，但很少.主要是因为它不必进行额外的> 0比较.
First one but marginally. Mostly because it doesn't have to do an extra > 0 comparison.
mysql> SELECT BENCHMARK(100000000,LOCATE('foo','foobar'));
+---------------------------------------------+
| BENCHMARK(100000000,LOCATE('foo','foobar')) |
+---------------------------------------------+
| 0 |
+---------------------------------------------+
1 row in set (3.24 sec)
mysql> SELECT BENCHMARK(100000000,LOCATE('foo','foobar') > 0);
+-------------------------------------------------+
| BENCHMARK(100000000,LOCATE('foo','foobar') > 0) |
+-------------------------------------------------+
| 0 |
+-------------------------------------------------+
1 row in set (4.63 sec)
mysql> SELECT BENCHMARK(100000000,'foobar' LIKE '%foo%');
+--------------------------------------------+
| BENCHMARK(100000000,'foobar' LIKE '%foo%') |
+--------------------------------------------+
| 0 |
+--------------------------------------------+
1 row in set (4.28 sec)
mysql> SELECT @@version;
+----------------------+
| @@version |
+----------------------+
| 5.1.36-community-log |
+----------------------+
1 row in set (0.01 sec)