What are some common mistakes people make with SQL?
An example of an AI chatbot conversation about common SQL mistakes.
What are some common mistakes people make with SQL?
Some common mistakes include using SELECT * instead of specifying columns, not using indexes, and forgetting to handle NULL values.
Can you explain why using SELECT * is a bad practice?
Using SELECT * can lead to performance issues, especially with large tables, and it can also return unnecessary data.
What about not using indexes? Why is that important?
Indexes improve query performance by allowing the database to find rows faster, reducing the time it takes to execute queries.
How can I handle NULL values properly in SQL?
You can use functions like COALESCE or ISNULL to handle NULL values, ensuring your queries return the expected results.
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