Top 5 Best practices to handle Null Values in SQL?
Best practices to handle Null values in SQL?
More Examples :
Avoiding Nulls in WHERE Clauses:
SELECT * FROM table_name WHERE column_name IS NULL;
When checking for NULL values, you should use IS NULL or IS NOT NULL instead of using = or !=, as comparing with NULL using equality operators does not yield meaningful results.
Avoiding Nulls in Primary Keys:
CREATE TABLE products (
id INT PRIMARY KEY, — This ensures id cannot be NULL
name VARCHAR(50)
);
In this example, the id column is defined as the primary key, which means it cannot contain NULL values.
Avoiding Nulls in Index Columns:
CREATE INDEX index_name ON table_name (column_name); — Avoid making column_name nullable
When creating an index, it’s generally a good practice to avoid using columns that can contain a high percentage of NULL values.
Remember to replace table_name and column_name with the actual names from your database schema. These examples demonstrate best practices for handling NULL values in SQL Server using SSMS.
Happy Learning!
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