John Smith thinks that all creatures are equal.()
John Smith thinks that all creatures are equal.()
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Last Saturday ___________________ had a picnic in Beiquan Park.A、John, Mary and meB、John, Mary and IC、John, I and MaryD、 I, John and Mary
Examine the data in the EMPLOYEES table.EMPLOYEESEMP_NAME DEPT_ID MGR_ID JOB_ID SALARYEMPLOYEE_ID101 Smith 20 120 SA_REP 4000102 Martin 10 105 CLERK 2500103 Chris 20 120 IT_ADMIN 4200104 John 30 108 HR_CLERK 2500105 Diana 30 108 IT_ADMIN 5000106 Smith 40 110 AD.ASST 3000108 Jennifer 30 110 HR_DIR 6500110 Bob 40 EK_DIR 8000120 Revi 20 110 SA_DIR 6500On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. The JOB_ID column is a NOT NULL column.Evaluate this DELETE statement:DELETE employee_id, salary, job_idFROM employeesWHERE dept_id = 90;Why does the DELETE statement fail when you execute it?（）A. There is no row with dept_id 90 in the EMPLOYEES table.B. You cannot delete the JOB_ID column because it is a NOT NULL column.C. You cannot specify column names in the DELETE clause of the DELETE statement.D. You cannot delete the EMPLOYEE_ID column because it is the primary key of the table.
Which command will create a group called ‘delivery’and set the administrators to john’ and ‘mary’?() A.mkgroup -A=john,mary deliveryB.groupadd -A=john,mary deliveryC.mkgroup adms=john,mary deliveryD.groupadd adms=john,mary delivery
下列值不为true的表达式有( )。A、"john"=="john"B、"john".equals("john")C、"john"="john"D、"john".equals(newString("john"))
Last Sunday had a picnic in Beihai Park．A.John,Mary and meB.John,I and MaryC.John,Mary and ID.I,John and Mary
通过 SQL，从 “actor” 表中选取 "FirstName" 列的值等于"John" 的所有记录的表述正确的是（）。A．SELECT * FROM Actor WHERE FirstName='John'B．SELECT [all] FROM Actor WHERE FirstName LIKE 'John'C．SELECT * FROM Actor WHERE FirstName LIKE 'John'D．SELECT [all] FROM Actor WHERE FirstName='John'
下述语句中，（）可以在字符串s1和s2相等时显示"Equal."。A．if(!strcmp(s1,s2)) puts(“Equal.”);B．if(s1==s2) puts(“Equal.”)C．if(*s1==*s2) puts(“Equal.”)D．if(strcmp(s1,s2)) puts(“Equal.”);