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LeetCode SQL Problem Solving Questions With Solutions (122 Pages)
Stop Making These SQL Mistakes! Learn from This Comprehensive Roadmap
Are you struggling to understand SQL & constantly running into errors? You’re not alone! Avoid common pitfalls & master SQL from basics to advanced concepts with this step-by-step roadmap.
Introduction to SQL:
– Overview of SQL & its role in data management
– SQL syntax & structure
– Different types of SQL databases (e.g., MySQL, PostgreSQL, SQL Server, Oracle)
– Setting up your environment: installing & configuring SQL databases
SQL Basics:
– Creating databases & tables
– Inserting data into tables with INSERT statements
– Retrieving data using SELECT statements
– Filtering data with WHERE clauses
– Sorting data with ORDER BY clauses
– Updating & deleting data with UPDATE & DELETE statements
Data Types and Functions:
– Common data types: INT, VARCHAR, DATE, BOOLEAN, etc
– String functions: CONCAT, SUBSTRING, LENGTH, TRIM
– Numeric functions: ABS, ROUND, CEIL, FLOOR
– Date and time functions: NOW, CURDATE, DATEADD, DATEDIFF
– Aggregate functions: COUNT, SUM, AVG, MAX, MIN
Joins & Subqueries:
– Inner Join
– Left Join
– Right Join
– Full Outer Join
– Cross Join
– Self Join
– Subqueries: Single-row, Multi-row & Correlated subqueries
Advanced SQL Concepts:
– Views: Creating, modifying & dropping views
– Indexes: Creating & using indexes to optimize queries
– Transactions: COMMIT, ROLLBACK & SAVEPOINT
– Stored Procedures: Creating, executing & modifying stored procedures
– Functions: Creating & using user-defined functions
– Triggers: Creating & managing triggers
Window Functions:
– Introduction to window functions
– Ranking functions: ROW_NUMBER, RANK, DENSE_RANK
– Aggregate functions with window specification
– Analytic functions: LAG, LEAD, FIRST_VALUE, LAST_VALUE
Performance Optimization:
– Query optimization & execution plans
– Index optimization & maintenance
– Partitioning tables
– Optimizing joins & subqueries
– Best practices for writing efficient SQL queries
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