知识大全 Oracle数据库删除语句DELETE的一般性用法

Posted 2022-07-15 数据库

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　　语法与其它的sql数据库教程是一样的如下 DELETE FROM COURSES WHERE COURSE_DESIGNATER = Java

　　按条件比较复杂的操作方法

　　DELETE FROM CLASSCONVENINGS WHERE CLASSES_NUM_FK > AND CLASS_CONVENE_DATE = TO_DATE( : : YYYY MM DD HH :MI:SS ) AND CLASS_LOCATION_FK = Seattle Training Room

　　下面来看个详细的实例

　　SQL> create demo table SQL> create table Employee(     ID                 VARCHAR ( BYTE)         NOT NULL     First_Name         VARCHAR ( BYTE)     Last_Name          VARCHAR ( BYTE)     Start_Date         DATE     End_Date           DATE     Salary             Number( )     City               VARCHAR ( BYTE)     Description        VARCHAR ( BYTE) ) /
　　Table created
　　SQL> SQL> prepare data SQL> insert into Employee(ID First_Name Last_Name Start_Date                      End_Date                        Salary City        Description)                values ( Jason     Martin to_date( YYYYMMDD ) to_date( YYYYMMDD ) Toronto Programmer ) /
　　 row created
　　SQL> insert into Employee(ID First_Name Last_Name Start_Date                      End_Date                        Salary City        Description)                 values( Alison    Mathews to_date( YYYYMMDD ) to_date( YYYYMMDD ) Vancouver Tester ) /
　　 row created
　　SQL> insert into Employee(ID First_Name Last_Name Start_Date                      End_Date                        Salary City        Description)                 values( James     Smith    to_date( YYYYMMDD ) to_date( YYYYMMDD ) Vancouver Tester ) /
　　 row created
　　SQL> insert into Employee(ID First_Name Last_Name Start_Date                      End_Date                        Salary City        Description)                 values( Celia     Rice     to_date( YYYYMMDD ) to_date( YYYYMMDD ) Vancouver Manager ) /
　　 row created
　　SQL> insert into Employee(ID First_Name Last_Name Start_Date                      End_Date                        Salary City        Description)

　　 values( Robert Black to_date( YYYYMMDD ) to_date( YYYYMMDD ) Vancouver Tester )

　　 row created

　　SQL> insert into Employee(ID First_Name Last_Name Start_Date End_Date Salary City Description) values( Linda Green to_date( YYYYMMDD ) to_date( YYYYMMDD ) New York Tester ) /

　　 row created

　　SQL> insert into Employee(ID First_Name Last_Name Start_Date End_Date Salary City Description) values( David Larry to_date( YYYYMMDD ) to_date( YYYYMMDD ) New York Manager ) /

　　 row created

　　SQL> insert into Employee(ID First_Name Last_Name Start_Date End_Date Salary City Description) values( James Cat to_date( YYYYMMDD ) to_date( YYYYMMDD ) Vancouver Tester ) /

　　 row created

　　SQL> SQL> SQL> SQL> display data in the table SQL> select * from Employee /

　　ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION Jason Martin JUL JUL Toronto Programmer Alison Mathews MAR FEB Vancouver Tester James Smith DEC MAR Vancouver Tester Celia Rice OCT APR Vancouver Manager Robert Black JAN AUG Vancouver Tester Linda Green JUL JAN New York Tester David Larry DEC FEB New York Manager

　　ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION James Cat SEP APR Vancouver Tester

　　 rows selected

　　SQL> SQL> SQL> SQL> SQL> SQL> SQL> delete mand with conditions SQL> SQL> delete from Employee where Salary > ;

　　 rows deleted

　　SQL> SQL> select * from Employee;

　　ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION Jason Martin JUL JUL Toronto Programmer Celia Rice OCT APR Vancouver Manager Robert Black JAN AUG Vancouver Tester James Cat SEP APR Vancouver Tester

　　 rows selected

　　删除指定的内容

　　SQL> CREATE TABLE project ( pro_id NUMBER( ) pro_name VARCHAR ( ) budget NUMBER( ) CONSTRAINT project_pk PRIMARY KEY (pro_id) );
　　Table created
　　SQL> SQL> SQL> INSERT INTO project(pro_id pro_name budget)VALUES ( A );
　　 row created
　　SQL> INSERT INTO project(pro_id pro_name budget)VALUES ( ERP );
　　 row created
　　SQL> INSERT INTO project(pro_id pro_name budget)VALUES ( SQL );
　　 row created
　　SQL> INSERT INTO project(pro_id pro_name budget)VALUES ( CRM );
　　 row created
　　SQL> INSERT INTO project(pro_id pro_name budget)VALUES ( VPN );
　　 row created

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