You cannot create a non-clustered index on a table variable, unless the index is a side effect of a PRIMARY KEY or UNIQUE constraint on the table (SQL Server enforces any UNIQUE or PRIMARY KEY constraints using an index). Also, SQL Server does not maintain statistics on a table variable,...
表屬性是鍵-值對,您可以在執行CREATE TABLE或CREATE VIEW時初始化。 您可以使用ALTER TABLE或ALTER VIEW取消已存在或新的資料表屬性設定。 您可以使用資料表屬性來標記數據表,其中包含 SQL 未追蹤的資訊。 數據表選項 數據表選項的目的是將記憶體屬性傳遞至基礎記憶體,例如SERDE屬性至Hive。 表...
( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ) ] [ ON DELETE { NO ACTION | CASCADE } ] [ ON UPDATE { NO ACTION } ] [ NOT FOR ...
Temporary Tables And Table Variables In SQL 基本常识 1. 局部临时表(#开头)只对当前连接有效,当前连接断开时自动删除 2. 全局临时表(##开头)对其它连接也有效,在当前连接和其他访问过它的连接都断开时自动删除 3. 临时表就像普通表一样,它可以做索引等等 4. 临时表存在 tempdb database, 表变量存在 memory...
( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ) ] [ ON DELETE { NO ACTION | CASCADE } ] [ ON UPDATE { NO ACTION } ] [ NOT FOR ...
NOTICE: v_relname=pg_toast_17220_index , relpages=1 CALL postgres=# BULK COLLECT BULK COLLECT 将一个查询结果集保存起来。 示例1 postgres=# create table t5(f1 integer,f2 varchar(10)); CREATE TABLE postgres=# insert into t5 values(1,'tdsql_pg1'); ...
INDEX index_name ON {table | view } (column [ ASC | DESC ] [,...n]) 如:为表products 创建一个簇索引 create unique clustered index pk_p_id on products(p_id) 删除索引:drop index 五、视图 视图是从一个或多个表或视图中导出的表,其结构和数据是建立在对表的查询基础上的。
INTO variable_name [, variable_name ]... FROM table_name; 例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DECLARE bonus NUMBER(8,2); BEGIN SELECT salary * 0.10 INTO bonus FROM employees WHERE employee_id = 100; END; DBMS_OUTPUT.PUT_LINE('bonus = ' || TO_CHAR(bonus)); /...
INDEX SCHEMA COMMIT INNER SECURITYAUDIT COMPUTE INSERT SELECT CONSTRAINT INTERSECT SESSION_USER CONTAINS INTO SET CONTAINSTABLE IS SETUSER CONTINUE JOIN SHUTDOWN CONVERT KEY SOME CREATE KILL STATISTICS CROSS LEFT SYSTEM_USER CURRENT LIKE TABLE CURRENT_DATE ...
( @variable_name{UNKNOWN| =<literal_constant>} [ , ...n ] ) |OPTIMIZEFORUNKNOWN|PARAMETERIZATION{SIMPLE|FORCED} |QUERYTRACEON<integer_value>|RECOMPILE|ROBUSTPLAN|USEHINT(<use_hint_name>[ , ...n ] ) |USEPLANN'<xml_plan>'|TABLEHINT(<exposed_object_name>[ ,<table_hint>[ [ ...