Final answer:
In a SQL SELECT statement, keywords, table names, and column names are usually not case sensitive. This allows for flexibility in how they are written, although some databases like PostgreSQL have case-sensitive elements, and cross-platform compatibility may require consistent casing.
Step-by-step explanation:
In a SELECT statement, keywords, table names, and column names are, in general, not case sensitive in SQL. This means that you can write these elements in either uppercase or lowercase, and they would be interpreted in the same way by the SQL database engine. However, it's worth noting that this is not true for all database management systems, as some, like PostgreSQL, are case sensitive when it comes to table and column names that are not quoted. Others, like MySQL, are not case sensitive on Windows but are on Linux or Unix systems unless configured otherwise. To ensure cross-platform compatibility, it is often recommended to stick with a consistent case, usually uppercase for SQL keywords and proper casing for table and column names, as per their creation in the database.