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mysql simple doubt

 
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It is defining precision level.

...better to google it first and then put your question on the forum.
 
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Manoj, I think you got the wrong line. The line that is commented is defining a primary key for the table.
 
Vishal Hegde
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ya i know what primary key means but why did we write

constraint pk_e_no


before primary key
 
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Vishal,
It is the name of the constraint used to enforce the primary key. Sometimes we have a naming convention and want to use a specific name.
 
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Primay key is one type of constraints.There should be a way to differentiate Primary keys in datbase.
For example if i have another table called Dept with a primary key.
if we don't specify primary key name in your table .there will be a conflict in database system.
think that database has a SQL parser to understand give SQL statements.
correct me if i am wrong.I have no idean in mysql.
 
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