Now let’s break down how to write the SQL command to create a primary key. This command is known as the SQL PRIMARY KEY syntax: To create a new table with a primary key, you would use the following structure: CREATE TABLE table_name ( ...
具体步骤如下: CREATETABLEUniqueIDs(IDBINARY(16)PRIMARYKEY);GOCREATEPROCEDUREGenerateUniqueIDASBEGINDECLARE@NewIDBINARY(16);SET@NewID=NEWID();IFNOTEXISTS(SELECT1FROMUniqueIDsWHEREID=@NewID)BEGININSERTINTOUniqueIDs(ID)VALUES(@NewID);ENDELSEBEGINEXECGenerateUniqueID;-- 递归调用直到生成唯一IDENDEND 1. ...
='pageviews', VALUE_FORMAT='AVRO'); # create a table for the users topic: ksql> CREATE TABLE users (id VARCHAR PRIMARY KEY) WITH (KAFKA_TOPIC='users', VALUE_FORMAT='AVRO'); ksql> set 'auto.offset.reset'='earliest'; Successfully changed local property 'auto.offset.reset' to '...
F = FOREIGN KEY 约束 L = 日志 FN = 标量函数 IF = 内嵌表函数 P = 存储过程 PK = PRIMARY KEY 约束(类型是 K) RF = 复制筛选存储过程 S = 系统表 TF = 表函数 TR = 触发器 U = 用户表 UQ = UNIQUE 约束(类型是 K) V = 视图 X = 扩展存储过程 查询所有的数据库名: selectnamefrommaste...
SELECT wg.name AS workload_group_name, rp.name AS resource_pool_name, r.command, r.status, d.name AS database_name, COUNT(1) AS request_count, MIN(r.start_time) AS first_request_start_time, MAX(r.start_time) AS last_request_start_time, SUM(CAST(r.total_elapsed_ti...
PRIMARY KEY CLUSTERED ( [GroupID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO /*** Object: Table [dbo].[USERPHONE] ***/ SET ANSI_NULLS ON GO SET QUOTED_...
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its own result set */ /* @precommand and @postcommand may be used to force a single result set via a temp table. */ ...
| PROCESSLIST_DB | PROCESSLIST_COMMAND | +---+---+---+---+---+---+ | character_set_client | gbk | 19 | root@localhost | db | Query | | character_set_connection | gbk | 19 | root@localhost | db | Query | | character_set_database | utf8mb4 | 19 |...
SqlCommand cmd =newSqlCommand("sp_InsertRows", connection); cmd.CommandType = CommandType.StoredProcedure; 在大多数情况下,表值参数具有与其他批处理方法等效或更高的性能。 人们通常使用表值参数,因为它们比其他选项更灵活。 例如,其他方法(如 SQL 大容量复制)仅允许插入新行。 但是使用表值参数,可以在存储...
4. 最后进行验证安装是否成功 ,在应用程序中打开MySQL 8.0 Command Line Client 5. 打开客户端后会让你输入密码 ,输入密码后进入连接界面 。 6. 直接在下面输入show databases ; ,若出现下面的提示则证明安装成功 2.Linux下的安装 注意:以下操作步骤是针对rpm包进行的安装,且通过wget下载 检查是否安装过,若没...