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We know that normallisation decomposites the large no of tables in to small no of tables,after the decomposite if we want to join that table and getting the original table.then that join is known as lossless join,otherwise it is known as lossy join.
R
X Y L M
X1 Y1 L1 M1
X2 Y2 L2 M2
R1 a table ,Which consists of attributes such as x,y,l,m.If we want to decomposite it in to small no of tables then wer will get
r1 r2
X Y L M
X1 Y1 L1 M1
X2 Y2 L2 M2
After we decomposite the large table we get two small table,If we want to join that two table for getting the original table then
R
X Y L M
X1 Y1 L1 M1
X2 Y2 L2 M2
We got the original table wiyhout any lossing attribute so this join is called as losslessjoin or lossy join.
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