How to convert SQL column null value to 0 and varchar to decimal in sql query

Question

I need to convert a SQL column which is in varchar datatype to decimal and the null values to 0. This is my code to convert varchar to decimal :

SELECT 
    CAST(debit as DECIMAL(9,2)),
    CAST(credit as DECIMAL(9,2)),
    sum_accname,
    sum_date, 
    sum_description
FROM 
    sum_balance

I need to convert debit and credit column null values to zero. How to insert the null value converting part to this code?

Answer 1

SELECT 
    COALESCE(CAST(debit as DECIMAL(9,2)),0) as debit,
    COALESCE(CAST(credit as DECIMAL(9,2)),0) as credit,
    sum_accname,
    sum_date, 
    sum_description
FROM 
    sum_balance

Answer 2

Use COALESCE function to fetch NOT NULL values.

Try this:

SELECT 
    CAST(COALESCE(debit, '0') AS DECIMAL(9,2)),
    CAST(COALESCE(credit, '0') AS DECIMAL(9,2)),
    sum_accname,
    sum_date, 
    sum_description
FROM 
    sum_balance;

Answer 3

try this

SELECT 
    CAST(isnull(debit ,0) as DECIMAL(9,2)),
    CAST(isnull(credit,0) as DECIMAL(9,2)),
    sum_accname,
    sum_date, 
    sum_description
FROM 
    sum_balance

Answer 4

improved formatting,for sql server there is option for isnull.......
the query should be like this

SELECT isnull(CAST(debit as DECIMAL(9,2)),0), 
isnull(CAST(credit as DECIMAL(9,2)),0), sum_accname, sum_date, sum_description
FROM sum_balance