SELECT m.modulename , AVG(cd.current) avg_current FROM current_data cd JOIN modulesnames m ON m.filename = cd.panel WHERE cd.current > 0 AND DATE_FORMAT(cd.date,'%Y-%m') = '2009-08' AND cd.panel IN ('b1','b3','b15') GROUP BY panel; You really need some indexes: On mod...
Bug #29438 rollup with multiple "group by" column repeats last grouping column final rollup Submitted: 29 Jun 2007 3:36Modified: 29 Jul 2007 8:21 Reporter: avi weiss Email Updates: Status: No Feedback Impact on me: None Category: MySQL Server: GeneralSeverity: S3 (Non-critical) ...
这样,每个文件将用[mysqld]group列出相应服务的选项。 通过这种方法,为mysqld 5.5.9创建一个文件c:\my-opts1.cnf来确定相应选项,其内容如下所示。 [mysqld] basedir = C:/mysql-5.5.9 port = 3307 enable-named-pipe socket = mypipe1 对于mysqld 5.7.24,创建如下文件c:\my-opts2.cnf。 [mysqld] bas...
EachGNRvalue represents an option group number or range of group numbers. The value should be the number at the end of the group name in the option file. For example, theGNRfor a group named[mysqld17]is17. To specify a range of numbers, separate the first and last numbers by a dash...
MySQL支持MultipleActiveResultSets吗 mysql支持sql99吗 sql99连接查询 语法: select 查询列表 from 表1 别名 【连接类型】 join 表2 别名 on 连接条件 【where 筛选条件】 【group by 分组】 【having 筛选条件】 【order by 排序列表】 1. 2. 3....
MySQL can create composite indexes (that is, indexes on multiple columns). An index may consist of up to 16 columns. For certain data types, you can index a prefix of the column (see Section 10.3.5, “Column Indexes”). MySQL can use multiple-column indexes for queries that test all...
The [mysqld_multi] group can be used for options to mysqld_multi itself. [mysqldN] groups can be used for options passed to specific mysqld instances. The [mysqld] or [mysqld_safe] groups can be used for common options read by all instances of mysqld or mysqld_safe. You can ...
mysql> select APP_DOC_UID, DOC_VERSION, APP_UID, DOC_UID, APP_DOC_TYPE, APP_DOC_INDEX, APP_DOC_FIELDNAME from APP_DOCUMENT; APP_DOC_UIDDOC_VERSIONAPP_UIDDOC_UIDAPP_DOC_TYPEAPP_DOC_INDEXAPP_DOC_FIELDNAME 9981562705718050e816959058033346 1 2490631975717ff351ccda1005474345 -1 ATTACHED 1 [...
DATABASES = { 'default': {}, 'users': { 'NAME': 'user_data', 'ENGINE': 'django.db.backends.mysql', 'USER': 'mysql_user', 'PASSWORD': 'superS3cret' }, 'customers': { 'NAME': 'customer_data', 'ENGINE': 'django.db.backends.mysql', 'USER': 'mysql_cust', 'PASSWORD': 'ver...
SELECT DATE(date) day,AVG(current) avg_current,panel FROM my_log GROUP BY day,panel; SELECT DATE_FORMAT(date,'%Y-%m') month,AVG(current) avg_current,panel FROM my_log GROUP BY month,panel; SELECT DATE_FORMAT(date,'%Y-%m') month,AVG(current) avg_current FROM my_log GROUP BY month...