[Description] Advances to the first matching row on the index. If there are no matching rows, advances to the last row with values before the seek value, in index order. [Member name] 
BeforeEqual
A f t e r
A f t e r E q u a l
B e f o r e
B e f o r e E q u a l
F i r s t E q u a l
L a s t E q u a l