Обсуждение: Insert/update a column if it doesnot exists in a database using C program

I am a newbie in writing C programs to read postgresql database. 

I am writing a C program to insert two new columns to a table if they don't
exist. If they exists, then simply update it. 

I found a solution in the link:
http://stackoverflow.com/questions/12597465/how-to-add-column-if-not-exists-on-postgresql
but have no clue to implement it in a C program. Can anyone suggest a way to
implement it.. 




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