You issue the following statement: SQL> SELECT FIRSTNAME, LASTNAME FROM HR.EMPLOYEE; You receive the following error: 01578: ORACLE data block corrupted (file# 6, block # 54) ORA-01110 : data file 6: ’u01/oracle/oradata/data1.dbf’ How will you resolve this problem of data block corruption by reducing the mean time to recover (MTTR)?()
Consider the following table called EMPLOYEES: ID FIRSTNAME LASTNAME JOB LEVEL CLERK 3 If the following SQL statement is executed, how many rows will be deleted? DELETE FROM employees WHERE 1 = 1()
现有表Employee,字段:id(int)、firstname(varchar)、lastname(varchar);以下sql语句错误的是()
以下语句获取表中第1行第1列(FirstName列)的数据,其中正确的语句是()。
以下语句获取表中第1行第1列(FirstName列)的数据,其中错误的语句是()。
以下语句获取表中第1行第1列(FirstName列)的数据,其中错误的语句是()。
以下语句获取表中第1行第1列(FirstName列)的数据,其中正确的语句是()。