ODBC and JDBC Guide

46 FileMaker ODBC and JDBC Guide
The PREVENT INDEX CREATION attribute is not supported.
Example
DROP INDEX ON Salespeople.Salesperson_ID
SQL aggregate functions
Aggregate functions return a single value from a set of records. You can use an aggregate function as part
of a SELECT statement, with a field name (for example, AVG(SALARY)), or in combination with a column
expression (for example, AVG(SALARY * 1.07)).
You can precede the column expression with the DISTINCT operator to eliminate duplicate values. For
example:
COUNT (DISTINCT last_name)
In this example, only unique last name values are counted.
Examples
SELECT SUM (Sales_Data.Amount) AS agg FROM Sales_Data
SELECT AVG (Sales_Data.Amount) AS agg FROM Sales_Data
SELECT COUNT (Sales_Data.Amount) AS agg FROM Sales_Data
SELECT MAX (Sales_Data.Amount) AS agg FROM Sales_Data
WHERE Sales_Data.Amount < 3000
SELECT MIN (Sales_Data.Amount) AS agg FROM Sales_Data
WHERE Sales_Data.Amount > 3000
SQL expressions
Use expressions in WHERE, HAVING, and ORDER BY clauses of SELECT statements to form detailed
and sophisticated database queries.Valid expression elements are:
Aggregate function Returns
SUM The total of the values in a numeric field expression. For example, SUM(SALARY) returns the sum
of all salary field values.
AV G The average of the values in a numeric field expression. For example, AVG(SALARY) returns the
average of all salary field values.
COUNT The number of values in any field expression. For example, COUNT(NAME) returns the number of
name values. When using COUNT with a field name, COUNT returns the number of non-null field
values. A special example is COUNT(*), which returns the number of records in the set, including
records with null values.
MAX The maximum value in any field expression. For example, MAX(SALARY) returns the maximum
salary field value.
MIN The minimum value in any field expression. For example, MIN(SALARY) returns the minimum
salary field value.
Field names Numeric operators Relational operators
Constants Character operators Logical operators
Exponential notation Date operators Functions