HEIDENHAIN TNC 620 User Manual page 431

Programming Q Parameters | Accessing tables with SQL commands
Example: table name defined with path and file name
. . .
20 SQL Q5 "SELECT Meas_No,Meas_X,Meas_Y, Meas_Z FROM 'V:
\table\Tab_Example' WHERE Meas_No<20"
Parameter No. for result (return value for the
control):
0 successful read operation
1 faulty read operation
Database: SQL command text: programming
SQL instruction
SELECT with the table column(s) to be
transferred (separate multiple columns with ,
)
FROM with a table's synonym or path (place
the path in single quotation marks)
WHERE (optional) with column names,
condition, and comparison value (Q
parameters after : in single quotation marks)
ORDER BY (optional) with column names and
type of ordering (ASC for ascending, DESC for
descending order)
FOR UPDATE (optional) to lock write access to
the selected row for other processes
Conditions for WHERE entries
Condition
Equals
Not equal to
Less than
Less than or equal to
Greater than
Greater than or equal to
empty
Not empty
Linking multiple conditions:
Logical AND
Logical OR
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017
Programming
= ==
!= <>
<
<=
>
>=
IS NULL
IS NOT NULL
AND
OR
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