Renaming Columns And Constraints

最新推荐文章于 2019-07-09 09:37:52 发布

iteye_16478

最新推荐文章于 2019-07-09 09:37:52 发布

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文章标签： SQL

本文链接：https://blog.csdn.net/iteye_16478/article/details/81881488

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本文介绍如何使用Oracle9i对表、列、主键约束及支持该约束的索引进行重命名。通过一系列SQL命令展示了创建表、添加主键约束、查看约束和索引信息，并成功对这些元素进行了重命名。

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n addition to renaming tables and indexes Oracle9i Release 2 allows the renaming of columns and constraints on tables. In this example once the the TEST1 table is created it is renamed along with it's columns, primary key constraint and the index that supports the primary key:

SQL> CREATE TABLE test1 (
2 col1 NUMBER(10) NOT NULL,
3 col2 VARCHAR2(50) NOT NULL);

Table created.

SQL> ALTER TABLE test1 ADD (
2 CONSTRAINT test1_pk PRIMARY KEY (col1));

Table altered.

SQL> DESC test1
Name Null? Type
-------------------- -------- --------------------
COL1 NOT NULL NUMBER(10)
COL2 NOT NULL VARCHAR2(50)

SQL> SELECT constraint_name
2 FROM user_constraints
3 WHERE table_name = 'TEST1'
4 AND constraint_type = 'P';

CONSTRAINT_NAME
------------------------------
TEST1_PK

1 row selected.

SQL> SELECT index_name, column_name
2 FROM user_ind_columns
3 WHERE table_name = 'TEST1';

INDEX_NAME COLUMN_NAME
-------------------- --------------------
TEST1_PK COL1

1 row selected.

SQL> -- Rename the table, columns, primary key
SQL> -- and supporting index.
SQL> ALTER TABLE test1 RENAME TO test;

Table altered.

SQL> ALTER TABLE test RENAME COLUMN col1 TO id;

Table altered.

SQL> ALTER TABLE test RENAME COLUMN col2 TO description;

Table altered.

SQL> ALTER TABLE test RENAME CONSTRAINT test1_pk TO test_pk;

Table altered.

SQL> ALTER INDEX test1_pk RENAME TO test_pk;

Index altered.

SQL> DESC test
Name Null? Type
-------------------- -------- --------------------
ID NOT NULL NUMBER(10)
DESCRIPTION NOT NULL VARCHAR2(50)

SQL> SELECT constraint_name
2 FROM user_constraints
3 WHERE table_name = 'TEST'
4 AND constraint_type = 'P';

CONSTRAINT_NAME
--------------------
TEST_PK

1 row selected.

SQL> SELECT index_name, column_name
2 FROM user_ind_columns
3 WHERE table_name = 'TEST';

INDEX_NAME COLUMN_NAME
-------------------- --------------------
TEST_PK ID

1 row selected.