How to limit inserting data according to no of values for a field

Hi,
I have a task at hand. I have a table in a database.
When inserting a new record from webpage form in a field into
my database,
each value may repeat two or three times maximum for a
specific field..
I want a system to check if this value (e.g. : 414 from below
example)
exists twice and not more, then I do not want it to allow
recording third
time of same value. Or, for the example value of 450, I do
not want the
system to allow recording of fourth value as 450.
In brief, the system will check number of records containing
a value and its
limit, accordingly, it will allow an additional record or it
will not allow.
Please help !
I sense that it is easy. But, I could not figure out the
logic yet
Any solution would make my day.
Thank you
Hakan
For example,
Id Title Code
1 John 450
2 Abraham 414
3 Marry 418
4 Jennifer 414
5 Mike 450
6 Susan 412
7 Jeff 450
8 Tony 424

Thanks for the reply Sowmya.
I would like to know 2 things.
1. Is it ok to change the data type of the field 'USERF2_NUM ' which is in the table ESLL. from quan to char.
2. The table ESLL already has entries. if we change the data type from QUAN to CHAR what is the effect on the existing entries of the table .
Kindly reply me back.
Thanks & Regards,
Rajesh Kumar

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Hello Friends,
I have a requirement in which one of the change is to convert the data type of the field 'USERF2_NUM' in the table 'ESLL' from 'QUAN' to 'CHAR'.
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Thanks for the reply Sowmya.
I would like to know 2 things.
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How to limit inserting data according to no of values for a field

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