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30 Creating and Opening Files Chapter 2
Importing Data
Figure 2.12 Reading All Variables From the Big Class Table Stored in an Excel File
List of tables that are
accessible in the
current database
List of columns that appear in the
table. Highlight another table name in
the list on left to view its columns
Type the SQL
statement in this box
4 Click Execute SQL. The SQL statement becomes an SQL table variable in the JMP data table. (See
“Adding Table Variables,” p. 84, for details.)
For example, if you want to import only the name and age of females older than 14, then the SQL
shown in Figure 2.12 would be different. Instead of this statement:
SELECT * FROM Bigclass
you would write:
SELECT NAME, AGE FROM Bigclass where AGE>14 and SEX=‘F’
After you click Execute SQL, a JMP data table appears with columns Name and Age.
Note that you can enter any valid SQL statement and click Execute SQL to execute the command.
Valid SQL varies with the data source and ODBC driver.
Structured Query Language (SQL): A Reference
The following sections are a brief introduction to SQL. They give you insight to the power of queries,
and they are not meant to be a comprehensive reference.
Using the SELECT Statement
The fundamental SQL statement in JMP is the SELECT statement. It tells the database which rows to
fetch from the data source. When you completed the process described in “Opening Data from a
Database,” p. 26, you were actually sending the following SQL statement to your data source.
SELECT * FROM Solubil
The * operator is an abbreviation for “all columns.” So, this statement sends a request to the database to
return all columns from the specified data table.
Rather than returning all rows, you can replace the * with specific column names from the data table.
In the case of the Solubility data table example, you could select the ETH, OCT, and CCL4 columns
only by submitting this statement: