1 expression 1.1 = 1.1 <> 1.1 < 1.1 > 1.1 <= 1.1 >= 1.2 expression 1 ( row-value-expression ) 1.1 = 1.1 <> 1.2 ( row-value-expression ) 1 ( fullselect ) 1.1 = 1.1 <> 1.2 ( row-value-expression ) 1 ( row-value-expression ) 1.1 = 1.1 <> 1.2 ( fullselect )