The document outlines best practices for writing clean and efficient SQL, emphasizing the importance of readability, correct queries, and the effective use of indexes. It advises against using 'select *', suggests avoiding unnecessary distinct queries, and promotes the use of joins over subqueries. Additionally, it highlights the need for testing queries and documenting them while recommending the use of parameterized queries for security.

1. BEST PRACTICES
SQL
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2. INTRODUCTION
Writing clean and efficient SQL is essential.
Start by prioritizing readability with proper
formatting and meaningful names. Focus on
writing correct queries that return the
expected data. When it comes to efficiency,
avoid using SELECT * and target data filtering
with WHERE clauses. Utilize indexes and
consider best practices specific to your
database system. Remember, optimization is
for later - clear and correct queries are the
foundation.

3. Use explicit column names
BEST PRACTICES
01
Avoid using SELECT DISTINCT unnecessarily
02
Use proper indexing
03
Avoid using SQL functions in WHERE clauses
04
Use JOINs instead of subqueries
05
Optimize query ordering
06

4. BEST PRACTICES
Test queries with representative data
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Use parameterized queries or prepared statements
Properly handle transactions
Regularly analysed and optimize queries
Document your queries
Limit the use of NULL values

5. BY CLAUDIA ALVES
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