删除观测可使用()语句。
A.Delete/If
B.Drop/Keep
C.Drop/Delete
D.If/Drop
- · 有6位网友选择 A,占比60%
- · 有2位网友选择 C,占比20%
- · 有2位网友选择 B,占比20%
A.Delete/If
B.Drop/Keep
C.Drop/Delete
D.If/Drop
B.drop database
C.drop procedure
D.drop trigger
B.DROP INDEX mytable.myindex
C.DROP INDEX myindex
D.DROP mytable.myindex
A、brown
B、brownjon
C、' ' (missing character value)
D、,brownj
A、The DATA step fails execution.
B、The SAS data set Sales does not exist.
C、The SAS data set Sales has no observations.
D、The PRINT procedure contains a syntax error.
A、where hire_date='23feb2019'd;
B、where hire_date='23feb2019';
C、where hire_date='02/23/2019'd;
D、where hire_date='02/23/2019';
A、DATE10.
B、DDMMYY10.
C、WEEKDATE10.
D、DDMMYYYY10.
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