数据库的常用操作指令(随时保持更新)

1.创建表

CREATE table TableName(
Column_Name1 VARCHAR2(10) PRIMARY KEY,
Column_Name2 VARCHAR2(10) NUIQUE NOT NULL,
Column_Name3 int)
例如:
CREATE table test(
ID VARCHAR2(10) PRIMARY KEY,
NAME VARCHAR2(10) NOT NULL UNIQUE,
AGE int);
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2.插入数据

INSERT INTO Table_Name VALUES('','',);
例如:
INSERT INTO test VALUES('081026','Kaku',24);

3.更改表数据

UPDATE Table_Name
SET Column_Name1='CString',
Where Column_Name2='NUMBER'
例如:
update test
set id='081126'
where name = 'Kaku';

4.删除表数据

DELETE FROM Table_Name WHERE Column_Name1='CString' AND .......;
例如:
delete from test where id = '081126' and name = 'Kaku';

5.清空表中所有数据

TRUNCATE Table_Name;
例如:
truncate test;
6.添加表字段

ALTER TABLE Table_Name ADD COLUMN Column_name;
例如:
ALTER TABLE test ADD COLUMN sex VARCHAR2(3);

7.删除表字段

ALTER TABLE Table_Name DROP COLUMN Column_name;
例如:
ALTER TABLE test DROP COLUMN sex;

8.查询

SELECT * FROM Table_Name;
例如:
查询很灵活,在这暂不举例子,孰能生巧吧！

9.ALTER
TABLE

ALTER
TABLE table [ * ]

ADD [COLUMN] column type [column_constraint [ ... ]]

ALTER
TABLE table [ * ]

ALTER [COLUMN] column {SET DEFAULT value
| DROP DEFAULT}

ALTER
TABLE table [ * ]

ALTER [COLUMN] column SET STATISTICS
integer

ALTER
TABLE table [ * ]

RENAME [COLUMN] column TO newcolumn

ALTER
TABLE table

RENAME TO newtable

ALTER
TABLE table

ADD table constraint definition

ALTER
TABLE [ONLY] table

DROP CONSTRAINT constraint

{RESTRICT | CASCADE}

ALTER
TABLE table

OWNER TO new owner
10.数据表重命名

RENAME Table_Old TO Table_NEW;
例如:
rename test to test1;
11.模糊查询

SELECT * FROM Table_Name
WHERE COLUMN_Name LIKE '% **** %';
例如:
select * from test
where id = '039092'
and Name = 'Xuxm'
and address like '% China %';