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Check below differences.
ISNULL:
Determines if an expression is null (blank) and returns TRUE if it is. If it contains a value, this function returns FALSE.
Text fields are never null, so using this function with a text field always returns false. For example, the formula field IF(ISNULL(new__c) 1, 0) is always zero regardless of the value in the New field. For text fields, use the ISBLANK function instead.
Multi-select picklist fields are never null in s-controls, buttons, and email templates, so using this function with a multi-select picklist field in those contexts always returns false.
Empty date and date/time fields always return true when referenced in ISNULL functions.
Choose Treat blank fields as blanks for your formula when referencing a number, percent, or currency field in an ISNULL function. Choosing Treat blank fields as zeroes gives blank fields the value of zero so none of them will be null.
Merge fields can be handled as blanks, which can affect the results of components like s-controls because they can call this function.
When using a validation rule to ensure that a number field contains a specific value, use the ISNULL function to include fields that do not contain any value. For example, to validate that a custom field contains a value of ‘1,’ use the following validation rule to display an error if the field is blank or any other number: OR(ISNULL(field__c), field__c<>1)
ISBLANK:
Determines if an expression has a value and returns TRUE if it does not. If it contains a value, this function returns FALSE.
Use ISBLANK instead of ISNULL in new formulas. ISBLANK has the same functionality as ISNULL, but also supports text fields. Salesforce.com will continue to support ISNULL, so you do not need to change any existing formulas.
A field is not empty if it contains a character, blank space, or zero. For example, a field that contains a space inserted with the spacebar is not empty.
Use the BLANKVALUE function to return a specified string if the field does not have a value; use the ISBLANK function if you only want to check if the field has a value.
If you use this function with a numeric field, the function only returns TRUE if the field has no value and is not configured to treat blank fields as zeroes.
Reference:
https://salesforce.stackexchange.com/questions/8826/isblank-vs-isnull
http://salesforceapexcodecorner.blogspot.com/2011/06/diffrence-between-isnull-and-isblank.html
Please mark as Best Answer if above information was helpful.
Thanks,
All Answers
Check below differences.
ISNULL:
Determines if an expression is null (blank) and returns TRUE if it is. If it contains a value, this function returns FALSE.
Text fields are never null, so using this function with a text field always returns false. For example, the formula field IF(ISNULL(new__c) 1, 0) is always zero regardless of the value in the New field. For text fields, use the ISBLANK function instead.
Multi-select picklist fields are never null in s-controls, buttons, and email templates, so using this function with a multi-select picklist field in those contexts always returns false.
Empty date and date/time fields always return true when referenced in ISNULL functions.
Choose Treat blank fields as blanks for your formula when referencing a number, percent, or currency field in an ISNULL function. Choosing Treat blank fields as zeroes gives blank fields the value of zero so none of them will be null.
Merge fields can be handled as blanks, which can affect the results of components like s-controls because they can call this function.
When using a validation rule to ensure that a number field contains a specific value, use the ISNULL function to include fields that do not contain any value. For example, to validate that a custom field contains a value of ‘1,’ use the following validation rule to display an error if the field is blank or any other number: OR(ISNULL(field__c), field__c<>1)
ISBLANK:
Determines if an expression has a value and returns TRUE if it does not. If it contains a value, this function returns FALSE.
Use ISBLANK instead of ISNULL in new formulas. ISBLANK has the same functionality as ISNULL, but also supports text fields. Salesforce.com will continue to support ISNULL, so you do not need to change any existing formulas.
A field is not empty if it contains a character, blank space, or zero. For example, a field that contains a space inserted with the spacebar is not empty.
Use the BLANKVALUE function to return a specified string if the field does not have a value; use the ISBLANK function if you only want to check if the field has a value.
If you use this function with a numeric field, the function only returns TRUE if the field has no value and is not configured to treat blank fields as zeroes.
Reference:
https://salesforce.stackexchange.com/questions/8826/isblank-vs-isnull
http://salesforceapexcodecorner.blogspot.com/2011/06/diffrence-between-isnull-and-isblank.html
Please mark as Best Answer if above information was helpful.
Thanks,
It really helped me.
Use BLANKVALUE instead of NULLVALUE in new formulas. BLANKVALUE has the same functionality as NULLVALUE, but also supports text fields. Salesforce continues to support NULLVALUE, so you don’t need to change existing formulas.
Use:
NULLVALUE(expression, substitute_expression) and replace expression with the expression you want to evaluate; replace substitute_expression with the value you want to replace any blank values.
Tips:
Avoid using this function with text fields because they are never null even when they are blank. Instead, use the BLANKVALUE function to determine if a text field is blank.
Don’t use NULLVALUE for date/time fields.
Choose Treat blank fields as blanks for your formula when referencing a number, percent, or currency field in a NULLVALUE function. Choosing Treat blank fields as zeroes gives blank fields the value of zero so none of them will be null.
Use the same data type for both the expression and substitute_expression.
I will try to explain it to you in a way I understood it. Hope it helps.
IS BLANK:
Its a function which validates whether the field has some value or not. Value can be some digit( 0-9), alphabet( a-z A-Z), special character ( %,$,--). If your field contains any of them then this function will return false. If it contains Blank (" ") or no value then it will return True.
ISNULL:
This function will consider BLank (" ") as some value. And if your field has Blank(" ") then it will return false considering 'Blank' also as some value.
Further Explanation:
Use ISBLANK instead of ISNULL in new formulas. ISBLANK has the same functionality as ISNULL, but also supports text fields. Salesforce will continue to support ISNULL, so you do not need to change any existing formulas.
A field is not empty if it contains a character, blank space, or zero. For example, a field that contains a space inserted with the spacebar is not empty.
Use the BLANKVALUE function to return a specified string if the field does not have a value; use the ISBLANK function if you only want to check if the field has a value.
If you use this function with a numeric field, the function only returns TRUE if the field has no value and is not configured to treat blank fields as zeroes.
Please mark as Best Answer if above information was helpful.
Thanks,
S.Jabeena