Displaying all numbers with 2 decimal places

Question

Hi All,
We have a requirement in our code where we want that all numbers must be diplayed with 2 decimal places.
Eg: If a number is 21.234 then it should be displayed as 21.23
If a number is 21.289 then it should be displayed as 21.28
If a number is 21 then it should be displayed as 21.00
Can anyone please help me how to do it in a SQL query.
Regards,
Shruti

Answer 1

Hi, Shruti,
This shows a couple of things you can do:
COLUMN     trnc     FORMAT     999999.99
WITH     got_x     AS
     SELECT     empno / 1000     AS x
     FROM     scott.emp
SELECT     x
,     TO_CHAR (x,            '999999.99')     AS tc
,     TO_CHAR (TRUNC (x, 2), '999999.99')     AS trnc_tc
,     TRUNC (x, 2)                              AS trnc
FROM     got_x
;Output:
`        X TC         TRNC_TC          TRNC
     7.369       7.37       7.36       7.36
     7.499       7.50       7.49       7.49
     7.521       7.52       7.52       7.52
     7.566       7.57       7.56       7.56
     7.654       7.65       7.65       7.65
     7.698       7.70       7.69       7.69
     7.782       7.78       7.78       7.78
     7.788       7.79       7.78       7.78
     7.839       7.84       7.83       7.83
     7.844       7.84       7.84       7.84
     7.876       7.88       7.87       7.87
       7.9       7.90       7.90       7.90
     7.902       7.90       7.90       7.90
     7.934       7.93       7.93       7.93Column x is the number, as SQL*Plus displays it by default. Note there are as many digits after the decimal point as are needed.
Column tc shows how TO_CHAR can format the number, with exactly 2 digits after the decimal point. This automatically rounds the number to the nearest multiple of .01, so on the first row (for example) 7.369 gets displayed as 7.37.
user11272043 wrote:
... If a number is 21.289 then it should be displayed as 21.28You (apparantly) always want the number rounded toward 0, so column tc isn't quite what you want.
Column trnc_tc is exacly what you requested, with the numbr rounded toward 0 (when any rouning is necessry) and 2 digits after the decimal point.
Column tc is also exactly what you requested, but it uses SQL*Plus formatting rather than SQL. Also, column trnc is a NUMBER, while column trnc_tc is a VARCHAR2, because TO_CHAR, as its name hints, returns a VARCHAR2.
The SQL*Plus command
SET   NUMFORMAT  999999.99changes the default format for all number columns. If you use this, you can override it for individual columns by using TO_CHAR (since it returns a VARCHAR2, the NUMFORMAT doesn't apply),or a COLUMN command. Also, if you use SET NUMFORMAT 999999.99, you'll still have to explicitly TRUNC every number, or else 21.289 will come out as 21.29, not 21.28.