举 个例子来说,当创建一个表:PT_SCHE_DETAIL时,ORACLE就会为这个对象分配一个段.在这个段中,即使未插入任何记录,也至少有一个区被 分配,第一个区的第一个块就称为段头(SEGMENT HEADE),段头中就储存了一些信息,基中HWM的信息就存储在此.此时,因为第一个区的第一块用于存储段头的一些信息,虽然没有存储任何实际的记录, 但
CREATE OR REPLACE PROCEDURE PRO_TRUNC_DROP_LHR(COMMAND IN VARCHAR2, O_TYPE IN VARCHAR2, OWNER IN VARCHAR2, O_NAME IN VARCHAR2) AUTHID DEFINER AS V_SQL VARCHAR2(4000); BEGIN IF UPPER(COMMAND) IN ('DROP', 'TRUNCATE') AND UPPER(O_TYPE) IN ('TABLE', 'INDEX') THEN V_SQL := COMM...
一:几个查询表外键的脚本 select b.table_name, b.column_name from user_constraints a inner join user_cons_columns b on a.constraint_name = b.constraint_name where a.r_constraint_name in ( select e.constraint_name from user_constraints e where e.table_name = 'GK_ZWVCH' ) Oracle 查看一...
BANNER : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production BANNER_FULL : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production Version 21.3.0.0.0 BANNER_LEGACY : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production CON_ID : 0 PL/SQL p...
Action:Check the syntax of the command and retry the operation specifying either TRUNCATE CLUSTER or TRUNCATE TABLE. ORA-03291: invalid truncate option - missing STORAGE keyword Cause:The STORAGE keyword was not specified with the DROP or REUSE options of the TRUNCATE command. ...
The following command will remove all data from the Employee table in SQL Server, Oracle, MySQL, PostgreSQL databases. SQL Script: Truncate Table Statement Copy TRUNCATE TABLE Employee;The TRUNCATE command is not supported in SQLite. But alternatively, the DELETE command can be used to Delete al...
If we clear down the rows in T3, theTRUNCATE CASCADEstill fails, but theDELETE CASCADEworks as expected. -- Clear down T3. truncate table t3; select (select count(*) from t1) as t1_count, (select count(*) from t2) as t2_count, (select count(*) from t3) as t3_count from dual...
Oracle TRUNCATE TABLE InOracle, the syntax of the TRUNCATE TABLE statement is as follows: TRUNCATE TABLE [schema_name.]table_name [ PRESERVE MATERIALIZED VIEW LOG | PURGE MATERIALIZED VIEW LOG ] [ DROP STORAGE | REUSE STORAGE ] ; The following table describes the Oracle TRUNCATE TABLE statement...
The SQL:2008 standard includes a TRUNCATE command with the syntax TRUNCATE TABLE tablename. The clauses CONTINUE IDENTITY/RESTART IDENTITY also appear in that standard, but have slightly different though related meanings. Some of the concurrency behavior of this command is left implementation-defined ...
BANNER_LEGACY : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production CON_ID : 0 PL/SQL procedure successfully completed. 2.测试环境建立: --//drop table t purge ; SCOTT@book01p> create table t as select * from all_objects; ...