You can do to a temporary table the same things you do with regular tables. You can SELECT, INSERT, UPDATE, DELETE, and TRUNCATE them. And you can also use INDEX and add constraints. And finally, you can use DROP to erase them. Temporary tables live and die in TempDB. Knowing this a...
alter tablespace "TEST" add datafile '/dm8/data/TEST02.DBF' size 128 autoextend on next 2 maxsize 10240; 2、创建角色 create role testrole; grant CREATE TABLE to "testrole"; grant CREATE VIEW to "testrole"; grant CREATE INDEX to "testrole"; 3、创建用户 create user testuser IDENTIFIED ...
--DROP TABLE dbo.TemporalTableTEST4CREATETABLEdbo.TemporalTableTEST4 ( IDINTPRIMARYKEYCLUSTERED)GOINSERTINTOdbo.TemporalTableTEST4(ID)VALUES(1),(2),(3)GO--INSERT INTO dbo.TemporalTableTEST4(ID)--VALUES(4),(5),(6)--GOALTERTABLEdbo.TemporalTableTEST4ADDSysStartTime DATETIME2NOTNULLCONSTRAINTD...
DROP TABLE tablename 1. 5、增加一个列 Alter table tabname add column col type 1. 6、添加主键: Alter table tabname add primary key(col) 1. 删除主键: Alter table tabname drop primary key(col) 1. 7、创建索引: create [unique] index idxname on tabname(col….) 1. 删除索引: drop ind...
Тrace flags can be referenced directly in the table via a bookmark that you can add to the end of the URL, using this format #tfNNNN. For example, to jump directly to Trace Flag 1118 in the table, use dbcc-traceon-trace-flags-transact-sql#tf1118. Expand table Trace flagDescription...
to explicitly define a clustered or non-clustered index that could be configured as a non-unique index. Adding indexes to the SQL temp tables will enhance its performance if the index is chosen correctly, otherwise, it can cause performance degradation. Also, not every SQL Server temp table ...
Temporal Table(历史表)的最佳实践? 1)如果是做数据分析,比如统计一个平均值或者总数这样的分析,在History表的主键上建聚集列存储索引(clustered columnstore index); 2)如果是做审计,对数据行有效时间范围字段建聚集索引,然后对主键也建立索引; 创建Temporal Table(历史表) ...
临时表创建 // An highlighted block 两种临时表的语法: create global temporary table 临时表名 on commit preserve|delete...rows 用preserve时就是SESSION级的临时表,用delete就是TRANSACTION级的临时表一...
mysql> DROP TABLE IF EXISTS `sunshine`; -- 安全删除 2.7 索引操作 加索引 命令:alter table<表名>add index<索引名 (字段名1,字段名2 …)>; 代码语言:txt AI代码解释 mysql> alter table sunshine add index name_index1(name); 加主关键字索引 ...
--在表创建后,给字段添加约束 --方式一 alter table 表名add(列名 constraint 约束名 约束,...) --方式二 alter table 表名add constraint 约束名 约束(列名) 2、维护: --修改字段的约束 alter table 表名modify (列名 constraint 约束名 约束,...) 3、删除 alter table 表名drop constraint 约束名 ...