PostgreSQL, sum data from row of table? -

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 xabcd ---------- A 1 2 3 4B5 6 7 8C6 7 8 9  
 I want my sum to A = 1 + 2 + 3 + 4 and B and C, is there any command which can add a line of data to PostgreSQL?   
 
 
 There is no such built-in function, but you can just do the following:  < Pre>  select x, assuming that the data type of  a ,  b ,    c  and  d  are numerical.

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