How to Replace Blank (Null ) Values with 0 for All Records

How to replace blank (null ) values with 0 for all records?

Go to the query designer window, switch to SQL mode, and try this:

Update Table Set MyField = 0
Where MyField Is Null; 

Replacing NULL with 0 in a SQL server query

When you want to replace a possibly null column with something else, use IsNull.

SELECT ISNULL(myColumn, 0 ) FROM myTable

This will put a 0 in myColumn if it is null in the first place.

replace NULL with Blank value or Zero in sql server

You can use the COALESCE function to automatically return null values as 0. Syntax is as shown below:

SELECT COALESCE(total_amount, 0) from #Temp1

Replace empty cells with NULL values in large number of columns

Run the following query:

SELECT 'UPDATE yourtable SET ' + name + ' = NULL WHERE ' + name + ' = '''';'
FROM syscolumns
WHERE id = object_id('yourtable')
  AND isnullable = 1;

The output of this query will be a chunk of SQL script like this:

UPDATE yourtable SET column1 = NULL WHERE column1 = '';
UPDATE yourtable SET column2 = NULL WHERE column2 = '';
UPDATE yourtable SET column3 = NULL WHERE column3 = '';
-- etc...

Copy and paste that SQL script into a new query and run it to update all your columns.

Replace NULL and blank values in all Data Frame columns with the most frequent Non Null item of the respective columns

You can use mode() to find the most common value in each column:

for val in ['', 'NULL', '?']:
    df.replace(val, df.mode().iloc[0])

Because there may be multiple modal values, mode() returns a dataframe. Using .iloc[0] takes first value from that dataframe. You can use fillna() instead of replace() as @Wen does if you also want to convert NaN values.

Replace null with 0 in MySQL

Yes, by using COALESCE.

SELECT COALESCE(null_column, 0) AS null_column FROM whatever;

COALESCE goes through the list of values you give it, and returns the first non-null value.

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