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help related to sql query

 
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mfguy

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Joined: 31 Jul 2003
Posts: 4

PostPosted: Tue Aug 19, 2003 2:43 pm    Post subject: help related to sql query
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Hi All,
would anyone please give me the query for the below requirements
1.Need to change all the nullable values for column department with value 'abc' for a table.Here the column department is nullable.
2.I have a table with three columns a1,a2,a3.Here a1 is the primary key.The requirement is such that I have to add one more column a4 to this table and make this column a4 as the primary key instead of a1.How should I proceed with this requirement.Please give me the steps.
All sorts of help appreciated.
Thanks
mfguy
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mdtendulkar

Active User


Joined: 29 Jul 2003
Posts: 238
Location: USA

PostPosted: Tue Aug 19, 2003 3:54 pm    Post subject:
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Hello mfguy,

1)

UPDATE DEPTTBL SET DEPARTMENT = 'ABC' WHERE DEPARTMENT IS NULL


2)

follow the procedure below:
Code:

      a) drop the primary key constraint
      b) add a column
      c) based on conditions, make each row value unique and then add the
          primary key constraint.


This is possible only when the data added to the column is distinct.

Plz correct me if i am wrong anywhere,

Hope this will help you.

Regards

Mayuresh Tendulkar
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mcmillan

Site Admin


Joined: 18 May 2003
Posts: 1200
Location: India

PostPosted: Wed Aug 20, 2003 8:02 am    Post subject: Re
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Dear tendulkar,

You are not wrong... Good work. Keep it up. But you may need to create an UNIQUE Index on column A4 before adding the Primary key. (if you are not using a Schema Processor).
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