You can customize import options using the Database Explorer app after creating an SQL query and before importing data into the MATLAB® Workspace. For details about creating SQL queries, see Create SQL Queries Using Database Explorer App.
Follow these steps as a general workflow to customize import options by using the Set Import Options dialog box. This workflow assumes that you create an SQL query that selects all data from a database table containing employee information.
In the Options section, click Import Options. The Set Import Options dialog box opens and displays the default general options.
Under Variable Name, enter a different name for a specific variable to change its name in the imported data.
Under Variable Type, select a different variable type for
a specific variable to change its type in the imported data. The selected
variable type must be compatible with the database type. For valid data types,
see the Option1,OptionValue1,...,OptionN,OptionValueN
input argument of
the setoptions
function.
Under Missing Value, enter a different value for a specific variable to change how missing data is represented in the imported data. The data type of the specified value must match the variable type.
From the Option Type list, select Text
Options
. The Set Import Options dialog box displays the import
options for variables with text data types.
For details about customizing text import options, see the Option1,OptionValue1,...,OptionN,OptionValueN
input argument of
the setoptions
function.
After you select the datetime
variable type for any
variable in the general options, you can customize the datetime import options.
For example, assume that you set the HIRE_DATE variable to
the datetime
variable type. From the Option
Type list, select Datetime Options
.
The Set Import Options dialog box displays the import options for variables with
datetime
data types.
For details about customizing datetime import options, see the Option1,OptionValue1,...,OptionN,OptionValueN
input argument of
the setoptions
function.
After you select the categorical
variable type for
any variable in the general options, you can customize the categorical import
options. For example, assume that you set the JOB_ID
variable to the categorical
variable type. From the
Option Type list, select Categorical
Options
. The Set Import Options dialog box displays the import
options for variables with categorical
data types.
For details about customizing categorical import options, see the Option1,OptionValue1,...,OptionN,OptionValueN
input argument of
the setoptions
function.
Click OK. The dialog box closes and the Data Preview pane shows a preview of the data using the import options.
In the Import section, click to import all SQL query results as a table in
the MATLAB Workspace, according to the specified import options.
In the Import section, select Import Data > Generate MATLAB Script to display a MATLAB script in the MATLAB Editor. The script mimics the actions of customizing import
options in the Set Import Options dialog box for each option you set by using
the setoptions
function. For details about generating
MATLAB scripts, see Generate SQL Query and MATLAB Script.