1. 解释什么是全局临时表(Global Temporary Table) 全局临时表是一种在数据库中创建的临时存储结构,它在数据库实例的生命周期内存在。与会话级临时表不同,全局临时表的数据对所有会话可见,但其数据仅在创建该表的会话结束后或显式删除时才会消失。全局临时表的数据不会跨数据库会话持久化。 2. 给出创建全局临时...
(1)会话特有的临时表 CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>) ON COMMIT PRESERVE ROWS; (2)事务特有的临时表 CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>) ON COMMIT DELETE ROWS; CREATE GLOBAL TEMPORARY TABLE MyTempTable 所建的临时表虽然是存在的,但是你试一下in...
CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>) ON COMMIT PRESERVE ROWS; (2)事务特有的临时表 CREATE GLOBAL TEMPORARY <TABLE_NAME> (<column specification>) ON COMMIT DELETE ROWS; CREATE GLOBAL TEMPORARY TABLE MyTempTable 所建的临时表虽然是存在的,但是你试一下insert 一条记录然后用别...
obclient>CREATEGLOBALTEMPORARYTABLEtbl7(col1INT)ONCOMMITDELETEROWS;Query OK,0rowsaffected 创建一个带约束的表。 obclient>CREATETABLEtbl8(col1INT,col2INT,col3INT,CONSTRAINTequal_check1CHECK(col2=col3*2)ENABLEVALIDATE);Query OK,0rowsaffected ...
obclient>CREATEGLOBALTEMPORARYTABLEtbl7(col1INT)ONCOMMITDELETEROWS;Query OK,0rowsaffected 创建一个带约束的表。 obclient>CREATETABLEtbl8(col1INT,col2INT,col3INT,CONSTRAINTequal_check1CHECK(col2=col3*2)ENABLEVALIDATE);Query OK,0rowsaffected ...
create global temp table <table name> as select * from <table name> The preceding query only copies schema of table and did not include the data. For inserting data, you need to run theinsertcommand. Example: SYSTEM.ADMIN(ADMIN)=>select*fromt1;N---5(1row)SYSTEM.ADMIN(ADMIN)=>createg...
CREATE GLOBAL TEMPORARY TABLE TempEmp ( EMPNUM INT NOT NULL, NAMELAST CHAR(30) NOT NULL, NAMEFIRST CHAR(30) NOT NULL, CONSTRAINT EMPLOYEEPK PRIMARY KEY (EMPNUM) ) ) if SQLCODE=0 { w !,"表创建" } else { w !,"SQLCODE=",SQLCODE,": ",%msg ...
CREATE TABLE 语句 CREATE TABLE 语句定义表。 该定义必须包含表的名称及其列的名称和属性。 该定义可以包含表的其他属性,例如,其主键或检查约束。 要创建已创建的临时表,请使用 CREATE GLOBAL TEMPORARY TABLE 语句。 要声明已声明的临时表,请使用 DECLARE GLOBAL TEMPORARY TABLE 语句。
ClassMethodCreateTable3(){d $SYSTEM.Security.Login("_SYSTEM","SYS")nSQLCODE,%msg&sql(CREATEGLOBALTEMPORARYTABLETempEmp(EMPNUMINTNOTNULL,NAMELASTCHAR(30)NOTNULL,NAMEFIRSTCHAR(30)NOTNULL,CONSTRAINTEMPLOYEEPKPRIMARYKEY(EMPNUM)))ifSQLCODE=0{w!,"表创建"}else{w!,"SQLCODE=",SQLCODE,": ",%msg}...
CREATE [ { GLOBAL | LOCAL } TEMPORARY ] TABLE [ IF NOT EXISTS ] [ <owner>. ]<table-name> … ( column-definition [ column-constraint ] … [ , column-definition [ column-constraint ] …] [ , table-constraint ] … ) |{ ENABLE | DISABLE } RLV STORE …[ IN <dbspace-name> ] …...