WHILE @@FETCH_STATUS = 0BEGINIF(@log_reuse_wait >0)BEGINSELECT'-- '+QUOTENAME(@dbname) +' database has log_reuse_wait = '+ @log_reuse_wait_desc +' --'AS'Individual Database Report';ENDIF(@log_reuse_wait =1)BEGINSELECT'Consider running the checkpoint command to a...
-- 在 db_zhuzi 库下创建一张名为 zz_user 的用户表 CREATE TABLE `db_zhuzi`.`zz_user` ( -- 用户ID字段:int类型、不允许为空、设为自增列、声明为主键 `user_id` int(8) NOT NULL AUTO_INCREMENT PRIMARY "i_p_id" COMMENT '用户ID', -- 用户名称字段:字符串类型、运行为空、默认值为“新...
KSQL 是基于 Kafka 的 Streams API 进行构建的,所以它的两个核心概念是流(Stream)和表(Table)。 流是没有边界的结构化数据,数据可以被源源不断地添加到流当中,但流中已有的数据是不会发生变化的,即不会被修改也不会被删除。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATE STREAM pageviews (vi...
In SQL, the UPDATE Statement is used to modify the existing records in the database based on a given condition. The SQL query allows us to change one or more rows based on a specific condition. Syntax: UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition; ...
CREATE [EXTERNAL] TABLE [IF NOT EXISTS] table_name LIKE existing_table_name [LOCATION hdfs_path] data_type : primitive_type | array_type | map_type | struct_type primitive_type : TINYINT | SMALLINT | INT | BIGINT | BOOLEAN | FLOAT ...
(2)修改字段名和数据类型:alter table 表名 change 旧字段名 新字段名 新数据类型; 3. 删除字段:alter table 表名 drop 字段名; 4. 修改表名:alter table 表名 rename to 新表名; 5. 删除表: drop table [if exists] 表名; 6. 删除指定表并创建该表:truncate table 表名; ...
Expand table Command-line optionSupported on WindowsSupported on Linux and macOS Login-related options -A Yes No -C Yes Yes -d db_name Yes Yes -D Yes Yes -l login_timeout Yes Yes -E Yes Yes -g Yes Yes -G Yes Yes -H workstation_name Yes Yes -j Yes Yes -K application_...
会在相应的数据库实体类上绑定一个tablename属性.如下代码: [Table(Name="dbo.dnt_users")] publicpartialclassUserinfo : INotifyPropertyChanging, INotifyPropertyChanged { dnt_users是数据库中的物理表.而我们的产品有一个特性,就是允许用户定制表名称的前缀.其实"dnt_" ...
Expand table Command-line optionSupported on WindowsSupported on Linux and macOS Login-related options -A Yes No -C Yes Yes -d db_name Yes Yes -D Yes Yes -l login_timeout Yes Yes -E Yes Yes -g Yes Yes -G Yes Yes -H workstation_name Yes Yes -j Yes Yes -K application_...
To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTERTABLEtable_name ALTERCOLUMNcolumn_name datatype; My SQL / Oracle (prior version 10G): ALTERTABLEtable_name MODIFYCOLUMNcolumn_name datatype; ...