使用insert语句向表中插入三个员工的信息 insert into employee (id,name,gender)values (null,'张飞',1,); insert into employee values (null,'关羽',1,'1998-08-08','1998-10-01','财神爷','老大的二弟'); insert into employee values (null,'刘备',0,'1990-01-01','公司的老大'),(null,'赵...
普通索引: alter table table_name add index (id) 唯一索引: alter table table_name add unique 索引名称(列名) 2、删除索引: drop index 索引名 on 表名 3、显示索引信息: show index from table_name 【六】视图: 1、创建视图: create view 视图名称 as "select语句“ create view student_score as ...
引言 我是一名开发运维工程师,之前就有看到过有人说开发与运维就是挖坑和填坑的关系」。开发和运维之间确实存在密切的关系,但是就上述观点有失公平,过于片面。这样子说,会给所有开发者一个先入为主的不好印象,误导项目团队成员认为开发只是在制造问题,而运维只是在解决问题。实际上,开发工程师和运维工程师应该是协作...
UniqueKey UniqueKeyError UniqueKeyWarning UnitePath UnitOfMeasure UniversalPlatform UnknownApplication UnknownMember 取消連結 UnlinkVertical Unlock UnnestRelatedDocuments UnnestTreeView Unpin UnshelvePendingChanges 取消訂閱 UnsyncedCommits UpdateAnimation UpdateDatabase UpdateDatabaseError UpdateDatabaseOK UpdateListIte...
UniqueKey UniqueKeyError UniqueKeyWarning UnitePath UnitOfMeasure UniversalPlatform UnknownApplication UnknownMember 取消連結 UnlinkVertical Unlock UnnestRelatedDocuments UnnestTreeView Unpin UnshelvePendingChanges 取消訂閱 UnsyncedCommits UpdateAnimation UpdateDatabase UpdateDatabaseError UpdateDatabaseOK UpdateLi...
Cardinality INTEGER The number of values measuring the unique values in the index. Higher cardinality increases the opportunity of using an index. This value is updated every time SHOW INDEX is executed. Note that this is an approximate value. ...
-UniqueIdSpecifies the UniqueID of the virtual disk to make available to the specified host. Tabelle erweitern Type: String[] Aliases: Id Position: Named Default value: None Required: True Accept pipeline input: True Accept wildcard characters: False...
NameKeyRequiredTypeDescription Workshop UID workshop_uid True string The unique id of the workshop Returns Body WebhookEventSharedPageDownload Triggers when a sharing email is sentOperation ID: ShowcaseShareSendEmail Creates a Showcase Workshop webhook Parameters 展開表格 NameKeyRequiredTypeDescription...
eq_ref 使用PRIMARY KEY或者UNIQUE NOT NULL索引进行连接查询 EXPLAIN SELECT * FROM emp e1 LEFT JOIN emp e2 ON e1.empno = e2.empno const 查询最多能匹配一条记录 EXPLAIN SELECT * FROM emp WHERE empno = 7369 system 表只有一行记录,const的特例 / possible_keys 显示一个或者多个可能用于该SQL的索引...
Values account-config— Show account-config configuration access-control—Show access-control configuration audit-logging—Show the audit logging configurations auth-params—Show the auth-params configurations authentication—Show the authentication configuration cert-status-profile—Show certificate status...