比较SQL中不同类型的不同表中的两列

Question

There is a column that exists in 2 tables. In table 1, this column contains values in binary form ( int ), 1 and 0 , while the other table contains the column in form 'Y' and 'N' .

Essentially I need to display rows in table 1 that contain values that are different from values in table 2 for that column. How do I compute 1 to Y and 0 to N for comparison?

Example:

Table 1:

DateRecorded SchoolName StudentName isAbsent hasPassed
------------ ---------- ----------- -------- ---------
2011-04-03   ABC        John        Y        Y
2011-04-05   ABC        John        N        Y 

Table 2:

DateRecorded SchoolName StudentName isAbsent hasPassed
------------ ---------- ----------- -------- ---------
2011-04-03   ABC        John        0        1
2011-04-05   ABC        John        0        1

Should return row:

2011-04-03   ABC        John        Y        Y

from Table 1 as this row is conflicting with the same row in Table 2.

Answer 1

Try this:

SELECT * FROM tbl1

EXCEPT

SELECT 
    daterecorded,
    schoolname,
    studentname,
    CASE isAbsent WHEN 1 THEN 'Y' WHEN 0 THEN 'N' END AS isAbsent,
    CASE hasPassed WHEN 1 THEN 'Y' WHEN 0 THEN 'N' END AS hasPassed
FROM tbl2

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SQL-Fiddle Demo