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Oracle数据库删除语句DELETE的一般性用法

作者:不详 来源:网络 发布时间: 2014-09-08 21:58 点击:
语法与其它的sql数据库教程是一样的,如下 DELETE FROM COURSES WHERE COURSE_DESIGNATER = 'Java110' 按条件比较复杂的操作方法 DELETE FROM CLASSCONVENINGS WHERE CLASSES_NUM_FK 4 AND CLASS_CONVENE_DATE = TO_DATE('2006-02-15 00:00:00', 'YYYY-MM-DD HH24:MI:S

Oracle数据库删除语句DELETE的一般性用法

  语法与其它的sql数据库教程是一样的,如下

  DELETE FROM COURSES

  WHERE COURSE_DESIGNATER = 'Java110'

  按条件比较复杂的操作方法

  DELETE FROM CLASSCONVENINGS

  WHERE    CLASSES_NUM_FK    > 4

  AND CLASS_CONVENE_DATE = TO_DATE('2006-02-15 00:00:00',

                                   'YYYY-MM-DD HH24:MI:SS')

  AND CLASS_LOCATION_FK = 'Seattle-Training Room 1'

  下面来看个详细的实例

  SQL> -- create demo table

  SQL> create table Employee(

  2  ID               VARCHAR2(4 BYTE)       NOT NULL,

  3  First_Name       VARCHAR2(10 BYTE),

  4  Last_Name        VARCHAR2(10 BYTE),

  5  Start_Date       DATE,

  6  End_Date         DATE,

  7  Salary           Number(8,2),

  8  City             VARCHAR2(10 BYTE),

  9  Description      VARCHAR2(15 BYTE)

  10 )

  11 /

  Table created.

  SQL>

  SQL> -- prepare data

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,     Description)

  2             values ('01','Jason',  'Martin', to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto', 'Programmer')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,     Description)

  2              values('02','Alison', 'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,     Description)

  2              values('03','James',  'Smith', to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,     Description)

  2              values('04','Celia',  'Rice',  to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,     Description)

  2              values('05','Robert', 'Black', to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,      Description)

  2              values('06','Linda',  'Green', to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York', 'Tester')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,      Description)

  2              values('07','David',  'Larry', to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York', 'Manager')

  3 /

  1 row created.

  SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date,                   End_Date,                     Salary, City,      Description)

  2              values('08','James',  'Cat',   to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')

  3 /

  1 row created.

  SQL>

  SQL>

  SQL>

  SQL> -- display data in the table

  SQL> select * from Employee

  2 /

  ID FIRST_NAME LAST_NAME START_DAT END_DATE    SALARY CITY     DESCRIPTION

  ---- ---------- ---------- --------- --------- ---------- ---------- ---------------

  01 Jason    Martin   25-JUL-96 25-JUL-06  1234.56 Toronto  Programmer

  02 Alison   Mathews  21-MAR-76 21-FEB-86  6661.78 Vancouver Tester

  03 James    Smith    12-DEC-78 15-MAR-90  6544.78 Vancouver Tester

  04 Celia    Rice     24-OCT-82 21-APR-99  2344.78 Vancouver Manager

  05 Robert   Black    15-JAN-84 08-AUG-98  2334.78 Vancouver Tester

  06 Linda    Green    30-JUL-87 04-JAN-96  4322.78 New York Tester

  07 David    Larry    31-DEC-90 12-FEB-98  7897.78 New York Manager

  ID FIRST_NAME LAST_NAME START_DAT END_DATE    SALARY CITY     DESCRIPTION

  ---- ---------- ---------- --------- --------- ---------- ---------- ---------------

  08 James    Cat      17-SEP-96 15-APR-02  1232.78 Vancouver Tester

  8 rows selected.

  SQL>

  SQL>

  SQL>

  SQL>

  SQL>

  SQL>

  SQL> -- delete command with conditions

  SQL>

  SQL> delete from Employee where Salary > 3000;

  4 rows deleted.

  SQL>

  SQL> select * from Employee;

  ID FIRST_NAME LAST_NAME START_DAT END_DATE    SALARY CITY     DESCRIPTION

  ---- ---------- ---------- --------- --------- ---------- ---------- ---------------

  01 Jason    Martin   25-JUL-96 25-JUL-06  1234.56 Toronto  Programmer04 Celia    Rice     24-OCT-82 21-APR-99  2344.78 Vancouver Manager

  05 Robert   Black    15-JAN-84 08-AUG-98  2334.78 Vancouver Tester

  08 James    Cat      17-SEP-96 15-APR-02  1232.78 Vancouver Tester

  4 rows selected.

  删除指定的内容

  SQL> CREATE TABLE project (

  2  pro_id            NUMBER(4),

  3  pro_name          VARCHAR2(40),

  4  budget        NUMBER(9,2),

  5  CONSTRAINT project_pk PRIMARY KEY (pro_id)

  6 );

  Table created.

  SQL>

  SQL>

  SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1001, 'A',1912000);

  1 row created.

  SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1002, 'ERP',9999999);

  1 row created.

  SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1003, 'SQL',897000);

  1 row created.

  SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1004, 'CRM',294000);

  1 row created.

  SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1005, 'VPN',415000);

  1 row created.

  SQL>

  SQL>

  SQL> SET ECHO ON

  SQL> DELETE

  2 FROM project

  3 WHERE pro_id = 1006

  4
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