Posts in: Databases

Logical Operators: AND, OR, NOT

Use logical operators like AND, OR, and NOT to combine or negate conditions in SQL WHERE clauses.

Use CASE and DECODE to apply conditional logic and create dynamic columns in SQL queries.

Explore NULL-handling functions like NVL, NVL2, COALESCE, and NULLIF to manage default and fallback values in SQL.

Use GREATEST and LEAST functions to compare multiple expressions and return the maximum or minimum value.

Understand how to summarize data using SQL aggregation techniques and grouping methods like GROUP BY, HAVING, ROLLUP, and CUBE.