在Oracle数据库中,您可以使用DELETE语句进行删除操作。嵌套语句是指在DELETE语句中嵌套使用子查询来指定删除的条件。 以下是一个使用DELETE嵌套语句的示例: DELETE FROM table_name WHERE column_name IN (SELECT column_name FROM another_table WHERE condition); 复制代码 在上述示例中,您可以替换"table_name"为要...
oracleI基础入门(8)--table--Delete DELETE FROM 在某些情况下,我们会需要直接由数据库中去除一些资料。这可以藉由 DELETE FROM 指令来达成。它的语法是: DELETE FROM "表格名" WHERE {条件} 以下我们用个实例说明。假设我们有以下这个表格: Store_Information 表格 store_name Sales Date Los Angeles $1500 Jan...
Hi I have something similar to below, each of the table have 300k records, all are going on index path except the EMP table which has date filter is going on FTS. This is taking billions of buffer gets and getting out with ORA-01555. Both underlying tables EMP1 and EMP2 are heavily ...
SELECTconcat(concat('ALTER INDEX ', INDEX_NAME),' REBUILD;')FROMall_indexesWHEREowner='INDEX_OWNER_NAME'--可选查询条件,注意,如果指定该条件,索引拥有者必须大写ANDtable_nameIN('TABLE_NAME1 ','TABLE_NAME2','...','TABLE_NAMEN')--注意,表名必须大写 分析表 分析表,是为了使基于CBO的执行计划...
flashback table 表名 to timestamp to_timestamp(删除时间点',' frombyte yyyy-mm-dd hh24:mi:ss') 北亚企安数据恢复—oracle数据恢复 2、drop误删除的数据恢复方法。 oracle在删除表时没有直接将表所占的块清空,只是对该表的数据块做了可以被覆写的标志。oracle将已删除的表的信息放到了一个虚拟容器“回...
详解Oracle DELETE和TRUNCATE 的区别 语法delete from aa truncate table aa 区别1.delete from后面可以写条件,truncate不可以。 2.delete from记录是一条条删的,所删除的每行记录都会进日志,而truncate一次性删掉整个页,因此日至里面只记录页释放,简言之,delete from更新日志,truncate基本不,所用的事务日志空间较少...
DELETEFROMsales;Code language:SQL (Structured Query Language)(sql) And we got 625 rows deleted. 652 rows deleted.Code language:SQL (Structured Query Language)(sql) D) Oracle DELETE – delete cascade In practice, you often delete a row from a table that has a foreign key relationship with ...
Solved: Hello, everyone. I am having issues with running a DELETE statement on an Oracle 10g database. DELETE FROM tableA WHERE ID in (1,2,3) If there is only - 4306910
Oracle 大表数据删除/清理方法小结 一、 哪些表是大表 1. 按空间大小 包含CLOB大小但不含索引大小,如果库很大,全库统计会比较耗时,可以增加并行或过滤条件,分批处理。 SELECT owner,object_name,SUM(MB) FROM( select d.owner,d.table_name as object_name,sum(BYTES/1024/1024) MB from dba_extents a,...
1.Alter table : 1.添加和修改列 2.添加和删除约束 3.enable,disable约束 2.drop table命令移除表中所有行和表结构 3.rename,truncate,comment 4.当执行以上DDL语句时,事务自动提交 三、详细说明 1.增加列: 语法: 代码语言:javascript 代码运行次数:0 ...