ALTERTABLEtable_nameADDSUPPLEMENTAL LOGGROUPlog_group_name(column1,column2,column3)ALWAYS; 开启ALL 级别的补偿日志的方式如下: --方式一:开启 DataBase 级别ALTERDATABASEADDSUPPLEMENTAL LOGDATA(ALL)COLUMNS;--方式二:开启 Table 级别ALTERTABLEtable_nameADDSUPPLEMENTAL LOGDATA(ALL)COLUMNS; ...
INITIALLY INNEDIATE :每次向表中添加数据、修改表的数据或从表中删除数据是都检测则个约束。 INITALLY DEFERRED :只在有事务被提交是,才检测这个约束。 ALTERTABLEtable_nameADDCONSTRAINTconstraint_nameUNIQUE(column_name) DEFERRABLE INITIALLY DEFERRED; 获得有关约束的信息 SELECT*FROMuser_constraintsWHEREtable_name...
Typically, you use theINoperator in aWHEREclause for filtering data in a column with a list of values. Oracle IN operator examples# We’ll use theordersandemployeestables in thesample databasefor the demonstration: Basic Oracle IN operator examples# ...
imp system/manager buffer=64000 file=/backup/area.dmp fromuser=bill touser=billbak tables=area 文件中用户 bill 的表 area 就被导入到用户 billbak 中。 2.3 用 tar 命令做物理备份 1、#su - oracle 2、% tar cvf /dev/rmt0 . 把oracle 路径下所有文件备份到磁带机上 3、% tar xvf /dev/rmt0...
NVL(null_column,default_value); select ename sal*12 nvl(comm,0); 4.列转行函数 将emp表中的雇员名称按一行显示 select wm_concat(ename) as ename from emp 5.分析函数查询 分析函数是什么? 分析函数是Oracle专门用于解决复杂报表统计需求的功能强大的函数,它可以在数据中进行分组然后计算基于组的某种统计值...
This can be done in a minute. By reading this documentation you will also be able to: - Select only certain tables and/or column for export. - Rename some tables and/or column during export. - Select data to export following a WHERE clause per table. - Delay database constraints during...
How to find all constraints on a table in oracle Let’s first create the Tables SQL> CREATE TABLE "DEPT" ( "DEPTNO" NUMBER(2,0), "DNAME" VARCHAR2(14), "LOC" VARCHAR2(13), CONSTRAINT "PK_DEPT" PRIMARY KEY ("DEPTNO") ) ; ...
will give column_round a value of 1,234,600. The NUMBER datatype is the only datatype that stores numeric values in Oracle. The ANSI datatypes of DECIMAL, NUMBER, INTEGER, INT, SMALLINT, FLOAT, DOUBLE PRECISION, and REAL are all stored in the NUMBER datatype. The language or product ...
ALL_USERS If you need to find all users that are visible to the current users, you can query the ALL_USERS table. The syntax to retrieve user information from the ALL_USERS table in Oracle/PLSQL is: SELECT * FROM ALL_USERS; The ALL_USERS table contains the following columns: Column...
When specific quotas are assigned, the exact number is indicated in the MAX_BYTES column . This number is always a multiple of the database block size, so if you specify a tablespace quota that is not a multiple of the database block size, then it is rounded up accordingly. Unlimited qu...