Compare column between two tables (greater and equal to)

Question

I have two table, and i want to compare the two column from those two table. The column reflow in table f_product must greater and equal to column lreflow in table f_line. The coding that I used is

SELECT f_product.oiv,f_product.product,f_product.passive,f_product.pitch,f_product.reflow,f_line.lreflow,f_product.spi,f_product.scomp,f_product.pallet,f_product.printer,f_line.line  
FROM f_product,f_line  
WHERE f_product.passive=f_line.passive  
AND f_product.pitch=f_line.pitch  
AND f_product.spi=f_line.spi  
AND f_product.pallet=f_line.pallet  
AND f_product.printer=f_line.printer   
AND f_product.reflow >= f_line.lreflow  
AND oiv='PMLE4720A' .

However, the result display out did not compare out the column data in between f_product.reflow and f_line.lreflow. For example, the result still list out the result of reflow=8 and lreflow=10 where reflow is less than the value of lreflow. Is that my sql coding have any error?

Answer 1

I'm guessing this is Oracle? Sometimes it gets confused by the ambiguity between real where clauses and an implicit join using a where. I would recast it into ansi sql joins:

SELECT
.....
FROM
f_product a INNER JOIN f_line b ON 
(a.passive = b.passive AND
 a.pitch =b.pitch AND
 a.spi=b.spi AND
 a.pallet=b.pallet)
where oiv='PMLE4720A'
and  a.reflow >= b.lreflow  

Assuming the relationship between product and line is such that it makes sense to jion on these four fields...