Data Analytics and Video Tutorials
A Null value in a record represents an empty value in a database table. It differs from a value that is zero as this is an integer, and therefore not an empty value.
After building your data using a create statement, one of the next steps using SQL is to now get your data in, so it can be managed and updated where necessary. There are many ways to import your data including , one you could use is import a CSV file with an SQL query. Here…
When running an sql select query, most likely we may have a need to bring in data from other tables. The reason for this is that tables have a specific purpose for the data they store. One of the most important features of a data architecture is to avoid duplication. This has the impact of…