Difference between Check and where statement.

Question

Hello everybody i know that where clause is efficient than check condition.
But i want to know if in the following example,
     even after finding SBOOK_WA-CARRID = 'LH' ,
DOES THE CHECK CONDITION TERMINATES?? OR KEEP SEARCING TILL THE END OF INTERNAL TABLE?
IN THE 2nd EXAMPLE,
DOES THE WHERE CLAUSE EXHIBIT THE SAME PHENOMENON?
1st example:
SELECT * FROM SBOOK INTO SBOOK_WA.
  CHECK: SBOOK_WA-CARRID = 'LH' AND
         SBOOK_WA-CONNID = '0400'.
ENDSELECT.
2nd example:
SELECT * FROM SBOOK INTO SBOOK_WA
  WHERE CARRID = 'LH' AND
        CONNID = '0400'.
ENDSELECT.

Answer 1

Hi,
  Check statement will give low performance compare to where.
B'cause After selecting the record for database table you are checking the value.
WHERE: At the time of selection records from table you are checking. So based on condition record will select otherwise it will go for nect record with that database connection only.
In first example. : It will terminate the selection.No next search...
Second : it will continue the search....