How to create a primary key by 2 columns in sql??

as title
thx a lot.

Chris,
Well you have two basic ways. One is to issue an alter table command and define a PRIMARY KEY (also called a PK). The other is to create a UNIQUE index. The PRIMARY KEY creates an index anyway, though I prefer to just use unique indexes as you can specify more options in this manner. A table can only have 1 PK where as you can have multiple UNIQUE indexes. I also do not combine the PK definition directly into the CREATE TABLE command, as normally one would keep a seperate PK script, even if they did contain only unique indexes commands and not PK alter table commands.
Anyway, below are the two methods of making a PK/Unique object for your table. The table name used here is T1 ...
Method #1 (Primary Key)
ALTER TABLE T1 DROP PRIMARY KEY;
ALTER TABLE T1 ADD PRIMARY KEY
(Column_1,Column_2, ...)
STORAGE
     NEXT 512K
     MINEXTENTS 1
     MAXEXTENTS UNLIMITED
     PCTINCREASE 0
Method #2 (preferred) : Unique Index
DROP INDEX PK_T1;
CREATE UNIQUE INDEX PK_T1 ON T1
(Column_1,Column_2, ...)
TABLESPACE INDX
PCTFREE 10
STORAGE
     INITIAL 1M
     NEXT 512K
     MINEXTENTS 1
     MAXEXTENTS UNLIMITED
     PCTINCREASE 0
It's always best to define the storage clause for both the create table and it's indexes.
Hope this helps ya,
Tyler

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adi26 wrote:
This does not really work for me. What does that mean?
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Hello,
I have to create a table from a type that I created.
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Edited by: user8266437 on 29 avr. 2009 13:56
Edited by: user8266437 on 29 avr. 2009 13:56

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5 /
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2 /
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ERROR at line 1:
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Hi,
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ROW_ID ROWID
OWNER VARCHAR2(30)
TABLE_NAME VARCHAR2(30)
CONSTRAINT VARCHAR2(30)
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AAAc95AABAAA9EpAAE SYS TEST1 ID_PK
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1
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Actually the design is completely incorrect.
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Message was edited by: Maheswaran B

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How to create a primary key by 2 columns in sql??

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