Question

I am having a table called as ‘Alphabets’ with columns named from ‘A to G’.

Table Name: Alphabets

Column Names: A | B | C | D | E | F | G  

Now, I need a SQL query to retrieve all rows from the table which satisfy at least four criteria from the following list:

A = 1   
B = 2  
C = 3  
D = 4  
E = 5  
F = 6
G = 7

I am using Oracle 10g database.

Answer 1

SELECT * FROM Alphabets where
CASE WHEN A=1 THEN 1 ELSE 0 END +
CASE WHEN B=2 THEN 1 ELSE 0 END +
CASE WHEN C=3 THEN 1 ELSE 0 END +
CASE WHEN D=4 THEN 1 ELSE 0 END +
CASE WHEN E=5 THEN 1 ELSE 0 END +
CASE WHEN F=6 THEN 1 ELSE 0 END +
CASE WHEN G=7 THEN 1 ELSE 0 END >= 4

But something about this table and query seem suspect – It feels like it should really be a table of two columns, Letter and Value say.