Learn all SQL wildcard characters for pattern matching. Master the % and _ wildcards, combine them with LIKE, and search data with precision. Free tutorial with examples.
Tag: SQL for Beginners
SQL LIKE Operator — How to Search for Patterns in Text
Learn the SQL LIKE operator for pattern matching. Use % and _ wildcards to search strings, filter text data, and find partial matches with practical examples.
SQL COUNT, AVG, SUM — How to Perform Calculations on Data
Learn SQL aggregate functions COUNT, AVG, and SUM. Count rows, calculate averages, and sum values with WHERE conditions. Free tutorial with examples.
SQL MIN and MAX — How to Find Minimum and Maximum Values
Learn SQL MIN and MAX functions to find the smallest and largest values in a column. Use with WHERE, aliases, and GROUP BY with practical examples.
SQL TOP, LIMIT and FETCH FIRST — How to Limit Rows Returned
Learn how to limit the number of rows returned in SQL using LIMIT, TOP, and FETCH FIRST. Restrict results for pagination and top-N queries with practical examples.
SQL DELETE — How to Remove Rows from a Table
Learn the SQL DELETE statement to remove rows from a database table. Delete specific rows with WHERE, delete all rows, and avoid common mistakes with practical examples.
SQL UPDATE statement — How to Modify Existing Data in a Table
Learn the SQL UPDATE statement to modify existing data in a database table. Update single rows, multiple rows, and multiple columns with practical examples and exercises.
SQL NULL Values — How to Handle Missing Data
Learn how to handle NULL values in SQL. Use IS NULL and IS NOT NULL to check for missing data, and COALESCE to replace NULLs with default values. Free tutorial with examples.
SQL INSERT INTO — How to Add New Rows to a Table
Learn the SQL INSERT INTO statement to add new rows to a database table. Insert single rows, multiple rows, and specific columns with practical examples and exercises.
SQL ORDER BY clause — How to Sort Query Results
Learn the SQL ORDER BY clause to sort query results in ascending or descending order. Sort by single or multiple columns with practical examples and exercises.