Oracle returned the following message: 1 row deleted.Code language:SQL (Structured Query Language)(sql) B) Oracle DELETE – delete multiple rows from a table The following statement deletes all rows whose order id is 1: DELETEFROMsalesWHEREorder_id =1;Code language:SQL (Structured Query Langua...
针对delete操作引起的空间不释放现象,或者,更正式一点的说法,如何降低高水位线,方法有很多种,如,shrink space;move tablespace;create table xxx as select * from xxx 重建表等。使用这些方法前,我们的原则是: 如果可以truncate,直接truncate,该操作会重置高水位线,BLOCKS会被置为0,NUM_ROWS置为0;否则,优先使用sh...
1. CHAR类型数组变量 EXEC SQL for :delete_rows delete FROM table_name WHERE a= :a; 由于char对应于Oracle的char类型,因此若有空格,则此时char即使用memset初始化,但也会带有后面的空格,有可能造成delete时where a=:a由于空格不匹配无法删除,例如:a赋值为'a’,但数组长度是3,因此实际where条件是a='a ',...
When you delete rows from an updatable view, Oracle Database deletes rows from the base table. You cannot delete rows from a read-only materialized view. If you delete rows from a writable materialized view, then the database removes the rows from the underlying container table. However, the...
select TABLE_NAME,NUM_ROWS from dba_tables where OWNER='xxx' order by NUM_ROWS desc; 1. 整理好后交给开发,确认各大表是否可清理,需保存多久数据。 二、 清理分类 目前大致遇到以下几种场景: 1. 可以drop 备份表、临时表、已无用的表 时间范围分区表:索引改为local索引后,按分区drop ...
It is possible to delete all rows in a table without deleting the table. This means that the table structure, attributes, and indexes will be intact: DELETE FROMtable_name; or: DELETE * FROMtable_name; Delete All Null Records delete * from emp where comm is null; ...
obclient> CREATE TABLE tbl1(col1 INT PRIMARY KEY, col2 INT); Query OK, 0 rows affected obclient> INSERT INTO tbl1 VALUES(1,1),(2,2),(3,3),(4,4); Query OK, 4 rows affected Records: 4 Duplicates: 0 Warnings: 0 obclient> SELECT * FROM tbl1; +---+---+ | COL1 | COL...
obclient> CREATE TABLE tbl1(col1 INT PRIMARY KEY, col2 INT); Query OK, 0 rows affected obclient> INSERT INTO tbl1 VALUES(1,1),(2,2),(3,3),(4,4); Query OK, 4 rows affected Records: 4 Duplicates: 0 Warnings: 0 obclient> SELECT * FROM tbl1; +---+---+ | COL1 | COL...
Oracle Delete Statements Version 10.2 Basic Delete Statements 1.Delete All Rows: DELETE <table_name> or DELETE FROM <table_name>; CREATE TABLE t AS SELECT * FROM all_tables; SELECT COUNT(*) FROM t; DELETE FROM t; COMMIT; SELECT COUNT(*) ...
ename | deptno ---+--- ALLEN | 30 WARD | 30 MARTIN | 30 BLAKE | 30 CLARK | 10 KING | 10 TURNER | 30 JAMES | 30 MILLER | 10 (9 rows) 在执行不带WHERE子句的DELETE命令(如下所示)时,要非常小心: DELETE FROM tablename; 此语句会删除给定表中的所有行,使该表完全为空。且在执行此操作...