how to set column's value according to new value of a column in sql?

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SQL-Server-2005

I have a table name: Colors.

Colors:
ID(PrimaryKey,Identy)| Position | Color_Name
                             |            |
               1                  1               Red
               2                  2               Black
               4                  3               Blue
               5                  5               Purple
               8                  6               Pink

Now, when i going to insert a row having '2' as Position and 'Yellow' as Color_Name.

I have to reset position value of all rows of a table,insert the new row(2,Yellow) and need the following result in table.

ID(PrimaryKey,Identy)| Position | Color_Name
                             |            |
               1                  1               Red
               2                  3               Black
               4                  4               Blue
               5                  5               Purple
               8                  6               Pink
               9                  2               Yellow

How can i do this in a store procedure? or tell me the steps with SQL-statements to do this.

Thanks in advance.

Posted 11-May-11 17:42pm

tanishtaman

Updated 11-May-11 19:51pm

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tanishtaman 12-May-11 0:05am

Note: please note how 'Position' column is reseting.

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Abhinav S · Answer 1 · 2011-05-11T18:46:00

Solution 1

IMO, your logic flow would be something as follows -

Decide the position of the new color.
Scan through the list to see if that position is already taken by another color.
If no, then easy - just insert your record with this position.
If yes, then update the rows of all colors where position is greater than or equal to this position (incrementing position by 1).
Insert the current color now.

Good luck!

Posted 11-May-11 18:46pm

Abhinav S

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tanishtaman 12-May-11 1:03am

Thanks for your reply. Note the position of just Black,Blue color is incremented else not. Because, in first table there was no row having position 4, this fills that position too. Please write sql-statements too.

DeepikaSrivastava · Answer 2 · 2011-05-12T03:04:00

in SP follow below steps:

1.first find its already existed having postion 2
script : select * from Colors where position=2;
insert into Colors (position,color_name) values(2,Yellow);
if find then
run this script : update Colors set position=position+1;
else
run this script: insert into Colors (position,color_name) values(2,Yellow);
end

now run this script again: select * from Colors; you will see td row .