Improve documentation of SYSTEM_RANGE

h2/src/docsrc/html/systemtables.html

@@ -37,12 +37,27 @@ of all tables in the database as well as the current settings.
 <h2 id="range_table" class="notranslate">Range Table</h2>
 <p>
 The range table is a dynamic system table that contains all values from a start to an end value.
-The table contains one column called X. Both the start and end values are included in the result.
+Non-zero step value may be also specified, default is 1.
+Start value, end value, and optional step value are converted to BIGINT data type.
+The table contains one column called X.
+If start value is greater than end value and step is positive the result is empty.
+If start value is less than end value and step is negative the result is empty too.
+If start value is equal to end value the result contains only start value.
+Start value, start value plus step, start value plus step multiplied by two and so on are included in result.
+If step is positive the last value is less than or equal to the specified end value.
+If step in negative the last value is greater than or equal to the specified end value.
 The table is used as follows:
 </p>
-<p>Example:</p>
+<p>Examples:</p>
 <pre>
 SELECT X FROM SYSTEM_RANGE(1, 10);
+-- 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
+SELECT X FROM SYSTEM_RANGE(1, 10, 2);
+-- 1, 3, 5, 7, 9
+SELECT X FROM SYSTEM_RANGE(1, 10, -1);
+-- No rows
+SELECT X FROM SYSTEM_RANGE(10, 2, -2);
+-- 10, 8, 6, 4, 2
 </pre>
 
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