问题

The EMPLOYEE table contains the following information: EMPNO NAME WORKDEPT101 SAM A11 102

The EMPLOYEE table contains the following information: EMPNO NAME WORKDEPT101 SAM A11 102 JOHN C12 103 JANE -104 PAT Remote105 ANNE -106 BOB A11The MANAGER table contains the following information: MGRID NAME DEPTNO EMPCOUNT1 WU B01 - 2 JONES A11 - 3 CHEN - - 4 SMITH - -5 THOMAS C12 -After this statement is executed: UPDATE manager m SET empcount = (SELECT COUNT(workdept) FROM employee e WHERE workdept=m.deptno)What is the result of the following query？（）SELECT mgrid, empcount FROM MANAGER WHERE empcount IS NOT NULL ORDER BY mgrid

A. MGRID EMPCOUNT ----- -------- 1 0 2 2 5 1

B. MGRID EMPCOUNT ----- -------- 1 0 2 2 3 0 4 0 5 1

C. MGRID EMPCOUNT ----- -------- 1 3 2 3 3 3 4 3 5 3

D. MGRID EMPCOUNT ----- -------- 1 0 2 2 3 2 4 2 5 1

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