To remove only the rows where every column is null, you can use the following SQL query: DELETE FROM your_table WHERE column1 IS NULL AND column2 IS NULL AND column3 IS NULL AND column4 IS NULL
This query will delete all rows where every column is null. If a row has at least one non-null value in any of the columns, it will not be deleted.
Alternatively, if you want to keep the original table intact and just display the rows with non-null values, you can use the following SQL query:
SELECT * FROM your_table WHERE NOT (column1 IS NULL AND column2 IS NULL AND column3 IS NULL AND column4 IS NULL)
This query will select all rows where at least one column has a non-null value. The NOT operator negates the condition that every column is null, so only rows that satisfy this condition will be displayed.