HEIDENHAIN TNC 620 (81760x-02) - Manual (Page 333)

Accessing tables with SQL commands 9.9
9
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 2/2015 333
Optional:
WHERE selection criteria: A selection criterion
consists of a column name, condition (see
table) and comparator. Link several selection
criteria with logical AND or OR. Program the
comparative value directly or with a Q parameter.
A Q parameter is introduced with a colon and
placed in single quotation marks (see example).
Optional:
ORDER BY column name ASC for ascending
sorting, or
ORDER BY column name DESC for
descending sorting. If you program neither ASC
nor DESC, ascending sorting is executed by
default. The TNC places the selected rows in the
indicated column.
Optional:
FOR UPDATE (keyword): The selected rows
are locked against write-accesses from other
processes.
Condition Programming
Equal to = ==
Not equal to != <>
Less than <
Less than or equal to <=
Greater than >
Greater than or equal to >=
Linking multiple conditions:
Logical AND AND
Logical OR OR