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5. Which SQL statements would display the value 1890.55 as $1,890.55? (Choose three .)

A. SELECT TO_CHAR(1890.55,'$0G000D00')

FROM DUAL;

B. SELECT TO_CHAR(1890.55,'$9,999V99')

FROM DUAL; 

C. SELECT TO_CHAR(1890.55,'$99,999D99')                         

FROM DUAL;

D. SELECT TO_CHAR(1890.55,'$99G999D00')

FROM DUAL;

E. SELECT TO_CHAR(1890.55,'$99G999D99')

FROM DUAL;

Answer: ADE

答案解析：

G表示分組分隔符group

D表示小數點decimal point

V表示移動N位（小數點），乘以10的n次方後面跟幾位就是幾次方

如：

to_char(12,'99V999') ' 12000'

to_char(12.4,'99V999') ' 12400'

to_char(12.45, '99V9') ' 125'

0表示補齊位數。

實驗驗證

[email protected]

TO_CHAR(18

----------

 $1,890.55

[email protected]> SELECT TO_CHAR(1890.55,'$9,999V99') FROM DUAL;

TO_CHAR(1

---------

 $1,89055

[email protected]> SELECT TO_CHAR(1890.55,'$99,999D99') FROM DUAL;

SELECT TO_CHAR(1890.55,'$99,999D99') FROM DUAL

                       *

ERROR at line 1:

ORA-01481: invalid number format model

[email protected]>  SELECT TO_CHAR(1890.55,'$99G999D00') FROM DUAL;

TO_CHAR(189

-----------

  $1,890.55

[email protected]> SELECT TO_CHAR(1890.55,'$99G999D99') FROM DUAL;

TO_CHAR(189

-----------

  $1,890.55

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