Constraints on a table in Oracle can be found using the below views user_constraints: It provides information about constraints owned by the current user. all_constraints:shows information about constraints accessible to the current user, including those owned by other users. dba_constraints: provides...
column_name - name of the column constraint is on constraint - text of the check constraint status - status of the constraint (ENABLED/DISABLED) Rows One row represents one check constraint and its column in a database Scope of rows: (A) all check constraints with columns on a table acces...
iskey from user_tab_cols t, user_col_comments c, (select m.column_name from user_constraints s, usercons_columns m where lower(m.table_name)='表名' and m.table_name=stable_name and m.constraintname=s.constraintname ands.constraint_type'P') m where lower(t._name)='表...
SELECT DBMS_METADATA.GET_DDL('PROCEDURE', 'PROCEDURE_NAME', 'USER_NAME') FROM dual; --查看远程数据库对象的定义 SELECT DBMS_LOB.SUBSTR@dblinkname(DBMS_METADATA.GET_DDL@dblinkname('TABLE', 'TABLENAME', 'USERNAME')) FROM DUAL@dblinkname; 【表空间与数据文件信息】 查看用户默认表空间和临时表...
SELECT DBMS_METADATA.GET_DEPENDENT_DDL ('REF_CONSTRAINT', table_name, OWNER) FROM DBA_CONSTRAINTS WHERE owner = UPPER (TRIM('&TABLE_OWNER')) AND table_name = UPPER (TRIM('&TABLE_NAME')) AND CONSTRAINT_TYPE = 'R' AND ROWNUM = 1; ...
CREATE TABLE CREATE MATERIALIZED VIEW CREATE TRIGGER执行该过程也需要该特权COPY_TABLE_DEPENDENTS。 要让用户使用包重新定义其他模式中的表,必须授予用户以下权限: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CREATEANYTABLEALTERANYTABLEDROPANYTABLELOCKANYTABLESELECTANYTABLE ...
我们可以发现利用Drop table cascade constraints可以以刪除关联table t的constraint來达成你drop table t的目的,原來属于t1的foreign key constraint已经跟随着被删除掉了,但是,储存在table t1的资料可不会被删除,也就是说Drop table cascade constraints 是不影响到存储于objec里的row data。
Sequences exist independently of any particular table, so more than one table can use the same sequence number. Consider what might happen if you didn’t use Oracle sequences. You might store the last sequence number used in a column in a table. A user who wanted to get the next ...
Tests whether the given Column appears in any ColumnConstraint on its owning table of given constraint types. Parameters: col - the column to tests (must be parented by a table) constraintTypes - the types of ColumnConstraint to search for. Returns: true if the column appears in any of ...
From table_name versions between timestamp minvalue and maxvalue; 1. 2. 通过以上查询,根据versions_xid可以清晰地区分不同事务在不同时间对数据所作的更改。 由于这个查询需要从Undo中获取前镜像信息,如果Undo中的信息被覆盖,则以上查询将会失败。