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
For example, the
cd_collection table from Figure 27.2 has five columns, or fields:
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
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, ...