During SELECT operations,for ORDER BY and GROUPBY loops,the flag is checked after reading a block of rows.If the kill flag is set,the statement is aborted. ALTER TABLE ...
grant all on zabbix.*to zabbix@localhost identified by '123';END 找出要导入数据库的数据文件 [root@ns1~]#find/usr/share/zabbix-mysql/-name '*.sql' usr/share/zabbix-mysql/images.sql usr/share/zabbix-...
常见于排序 order by 和分组查询 groupby。下面来举一个例子来说明下 explain 的用法。先来一张表: CREATE TABLE IF NOT EXISTS `article`(`id` int(10)unsigned NOT NULL AUTO_INCREMENT, `author_id` ...
id|name|sex|age|address|+-+-+-+-+-+|2|李四|男|12|hebei|1|张三|男|22|beijing|4|wuhaixu|nan|23|hunan|3|王五|女|23|jiangsu|+-+-+-+-+-+count函数的用法:mysql>select count(*)as '总数' from user;总数|+-+...
《PostgreSQL 黑科技 range 类型及 gist index 20x+speedup than Mysql index combine query》 《PostgreSQL 黑科技 range 类型及 gist index 助力物联网(IoT)》 4、《PostgreSQL 物联网黑科技-瘦身几百倍的索引...
speedup than Mysql index combine query》《PostgreSQL 黑科技 range 类型及 gist index 助力物联网(IoT)》4、《PostgreSQL 物联网黑科技-瘦身几百倍的索引(BRIN index)》5、《PostgreSQL 10-JSON 内容全文检索》6...