SQL Server trigger to update the same table -

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i have sql server table has varchar column can save 4 characters

when insert value 963 column have add leading "0" this
example:

  • if insert 23 value should saved 0023
  • if insert 236 value should save 0236
  • if insert 2369 value should saves 2369

can add after trigger table, check if value inserted less 4 digits, , update same value in column leading "0"s appended value

will affect performance of trigger? practice have trigger update value in same table?

yes, can create trigger , 1 operation did not affect performance.
way change value when use in select. e.g 

select right('0000' + column, 4), ....

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