Ubuntu Unleashed 2015 Edition: Covering 14.10 and 15.04, Tenth Edition

Creating Tables

As mentioned previously, an RDBMS stores data in tables that look similar to spreadsheets. Of course, before you can store any data in a database, you need to create the necessary tables and columns to store the data. You do this by using the CREATE statement.

For example, the cd_collection table from Figure 29.2 has five columns, or fields: id, title, artist, year, and rating.

SQL provides several column types for data that define what kind of data will be stored in the column. Some of the available types are INT, FLOAT, CHAR, and VARCHAR. Both CHAR and VARCHAR hold text strings, with the difference being that CHAR holds a fixed-length string, whereas VARCHAR holds a variable-length string.

There are also special column types, ...