[SPARK-28799][DOC]Documentation for Truncate command

docs/sql-ref-syntax-ddl-truncate-table.md

@@ -19,4 +19,68 @@ license: |
   limitations under the License.
 ---
 
-**This page is under construction**
+### Description
+The `TRUNCATE TABLE` statement removes all the rows from a table or partition(s). The table must not be a view 
+or an external/temporary table. In order to truncate multiple partitions at once, the user can specify the partitions 
+in `partition_spec`. If no `partition_spec` is specified it will remove all partitions in the table.
+
+### Syntax
+{% highlight sql %}
+TRUNCATE TABLE table_name [PARTITION partition_spec];
+{% endhighlight %}
+
+### Parameters
+<dl>
+  <dt><code><em>table_name</em></code></dt>
+  <dd>The name of an existing table.</dd>
+</dl>
+
+<dl>
+  <dt><code><em>PARTITION ( partition_spec :[ partition_column = partition_col_value, partition_column = partition_col_value, ...] )</em></code></dt>
+  <dd>Specifies one or more partition column and value pairs. The partition value is optional.</dd>
+</dl>
+
+
+### Examples
+{% highlight sql %}
+
+--Create table Student with partition
+CREATE TABLE Student ( name String, rollno INT) PARTITIONED BY (age int);
+
+SELECT * from Student;
++-------+---------+------+--+
+| name  | rollno  | age  |
++-------+---------+------+--+
+| ABC   | 1       | 10   |
+| DEF   | 2       | 10   |
+| XYZ   | 3       | 12   |
++-------+---------+------+--+
+
+-- Removes all rows from the table in the partion specified
+TRUNCATE TABLE Student partition(age=10);
+
+--After truncate execution, records belonging to partition age=10 are removed
+SELECT * from Student;
++-------+---------+------+--+
+| name  | rollno  | age  |
++-------+---------+------+--+
+| XYZ   | 3       | 12   |
++-------+---------+------+--+
+
+-- Removes all rows from the table from all partitions
+TRUNCATE TABLE Student;
+
+SELECT * from Student;
++-------+---------+------+--+
+| name  | rollno  | age  |
++-------+---------+------+--+
++-------+---------+------+--+
+No rows selected 
+
+{% endhighlight %}
+
+
+### Related Statements
+- [DROP TABLE](sql-ref-syntax-ddl-drop-table.html)
+- [ALTER TABLE](sql-ref-syntax-ddl-alter-tabley.html)
+