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Oracle PL/SQL/Table/Change Column Size - История изменений
2026-05-14T13:27:45Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:54:54Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Alter table: Changes the size of a column==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> -- create demo table<br />
SQL> create table Employee(<br />
2 ID VARCHAR2(4 BYTE) NOT NULL,<br />
3 First_Name VARCHAR2(10 BYTE),<br />
4 Last_Name VARCHAR2(10 BYTE),<br />
5 Start_Date DATE,<br />
6 End_Date DATE,<br />
7 Salary Number(8,2),<br />
8 City VARCHAR2(10 BYTE),<br />
9 Description VARCHAR2(15 BYTE)<br />
10 )<br />
11 /<br />
Table created.<br />
SQL><br />
SQL> -- display data in the table<br />
SQL> select * from Employee<br />
2 /<br />
no rows selected<br />
SQL><br />
SQL><br />
SQL> desc employee;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
ID NOT NULL VARCHAR2(4)<br />
FIRST_NAME VARCHAR2(10)<br />
LAST_NAME VARCHAR2(10)<br />
START_DATE DATE<br />
END_DATE DATE<br />
SALARY NUMBER(8,2)<br />
CITY VARCHAR2(10)<br />
DESCRIPTION VARCHAR2(15)<br />
SQL><br />
SQL> --Changes the size of the Salary column:<br />
SQL><br />
SQL> ALTER TABLE Employee MODIFY (Salary number(11,2));<br />
Table altered.<br />
SQL><br />
SQL> desc employee;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
ID NOT NULL VARCHAR2(4)<br />
FIRST_NAME VARCHAR2(10)<br />
LAST_NAME VARCHAR2(10)<br />
START_DATE DATE<br />
END_DATE DATE<br />
SALARY NUMBER(11,2)<br />
CITY VARCHAR2(10)<br />
DESCRIPTION VARCHAR2(15)<br />
SQL><br />
SQL><br />
SQL> select * from employee;<br />
no rows selected<br />
SQL><br />
SQL><br />
SQL><br />
SQL> -- clean the table<br />
SQL> drop table Employee<br />
2 /<br />
Table dropped.<br />
SQL><br />
SQL><br />
SQL><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==Enlarge column width==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> create table t(<br />
2 id number,<br />
3 data varchar2(200) );<br />
SQL><br />
SQL><br />
SQL> Alter table t<br />
2 modify<br />
3 (<br />
4 id number,<br />
5 data varchar2(255)<br />
6 );<br />
<br />
SQL><br />
SQL> Alter table t<br />
2 ADD<br />
3 (<br />
4 data2 varchar2(100)<br />
5 );<br />
<br />
SQL><br />
SQL> drop table t;<br />
<br />
</source></div>
Admin