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SQL round off issue

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0

Consider these values which are of type MONEY (sample values and these can change)

select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041

for some reason I need to round each value to a scale of 3 like this

select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)

but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?

sql sql-server

share|improve this question

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."
  
  – Zohar Peled
  Mar 26 at 7:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  mathematics instead of technical, i believe. so just follow the way business requires.
  
  – Rex
  Mar 26 at 7:28
  

  
  
  
  

add a comment | 

0

Consider these values which are of type MONEY (sample values and these can change)

select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041

for some reason I need to round each value to a scale of 3 like this

select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)

but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?

sql sql-server

share|improve this question

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  "The money and smallmoney data types are accurate to a ten-thousandth of the monetary units that they represent. For Informatica, the money and smallmoney data types are accurate to a one-hundredth of the monetary units that they represent."
  
  – Zohar Peled
  Mar 26 at 7:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  mathematics instead of technical, i believe. so just follow the way business requires.
  
  – Rex
  Mar 26 at 7:28
  

  
  
  
  

add a comment | 

Consider these values which are of type MONEY (sample values and these can change)

select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041

for some reason I need to round each value to a scale of 3 like this

select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)

but when I take the sum they shows a very minor variation. first line of code returns 7721.7000. and the second one 7721.6990. But this variation in not acceptable. What is the best way to solve this ?

sql sql-server

share|improve this question

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

select 4796.529 + 1585.0414 + 350.9863 + 223.3549 + 127.6314+479.6529 + 158.5041

select round(4796.529,3)+ round(1585.0414,3)+ round(350.9863,3)+ round(223.3549,3)+ round(127.6314,3)+ round(479.6529,3)+ round(158.5041,3)

sql sql-server

sql sql-server

share|improve this question

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

share|improve this question

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

asked Mar 26 at 7:20

Vishnu BabuVishnu Babu

6381010 silver badges2424 bronze badges

2 Answers
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3

When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.

share|improve this answer

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

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add a comment | 

4

As Whencesoever said, your problem is mathmatical one, not a programming error.

• 12.5 + 11.6 = 24.1


• ROUND(12.5) + ROUND(11.6) = 25


• ROUND(12.5 + 11.6) = 24

I'd talk with the business and figure out where they want the rounding applied.

Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?

share|improve this answer

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?
  
  – user2366842
  Mar 27 at 2:27
  

  
  
  
  

add a comment | 

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3

When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.

share|improve this answer

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

add a comment | 

3

When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.

share|improve this answer

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

add a comment | 

When you round numbers before you sum them you will get a different result than if you round numbers after you have summed them. Simple as that. There is no way to solve this.

share|improve this answer

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

share|improve this answer

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

edited Mar 26 at 7:28

Dale Burrell

4,17855 gold badges2727 silver badges5757 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

answered Mar 26 at 7:26

WhencesoeverWhencesoever

1,68188 silver badges1919 bronze badges

4

As Whencesoever said, your problem is mathmatical one, not a programming error.

• 12.5 + 11.6 = 24.1


• ROUND(12.5) + ROUND(11.6) = 25


• ROUND(12.5 + 11.6) = 24

I'd talk with the business and figure out where they want the rounding applied.

Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?

share|improve this answer

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?
  
  – user2366842
  Mar 27 at 2:27
  

  
  
  
  

add a comment | 

4

As Whencesoever said, your problem is mathmatical one, not a programming error.

• 12.5 + 11.6 = 24.1


• ROUND(12.5) + ROUND(11.6) = 25


• ROUND(12.5 + 11.6) = 24

I'd talk with the business and figure out where they want the rounding applied.

Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?

share|improve this answer

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  if they're simply looking for a rounded total, then perhaps summing them up and rounding the result is what they're actually looking for instead of rounding each of the numbers individually?
  
  – user2366842
  Mar 27 at 2:27
  

  
  
  
  

add a comment | 

As Whencesoever said, your problem is mathmatical one, not a programming error.

• 12.5 + 11.6 = 24.1


• ROUND(12.5) + ROUND(11.6) = 25


• ROUND(12.5 + 11.6) = 24

I'd talk with the business and figure out where they want the rounding applied.

Also, as a side note, MONEY is a terrible datatype. If you can, you may want to consider switching to a DECIMAL. See Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?

share|improve this answer

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

share|improve this answer

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges

answered Mar 26 at 7:37

MooseMoose

17099 bronze badges