Added docs

h2/src/docsrc/help/help.csv

@@ -122,6 +122,37 @@ key is set to 0; otherwise it is set to the new key.
 MERGE INTO TEST KEY(ID) VALUES(2, 'World')
 "
 
+"Commands (DML)","MERGE USING","
+MERGE INTO targetTableName [AS targetAlias] 
+USING { ( select ) | sourceTableName }[ AS sourceAlias ]
+ON ( expression ) 
+[ WHEN MATCHED THEN [ update ] [ delete] ]
+[ WHEN NOT MATCHED THEN insert  ]
+","
+Updates or deletes existing rows, and insert rows that don't exist. The ON clause 
+specifies the key column expression and must be specified. If more than one row is updated 
+per input row, an exception is thrown. 
+If the source data contains duplicate rows (specifically those columns used in the 
+row matching ON clause), then an exception is thrown to prevent two updates applying 
+to the same target row. The embedded update, delete or insert statements can not re-specify 
+the target table name.
+","
+MERGE INTO TARGET_TABLE AS T USING SOURCE_TABLE AS S 
+  ON (T.ID = S.ID)
+  WHEN MATCHED THEN 
+ 	UPDATE SET T.COL1 = S.COL1 WHERE T.COL2<>'FINAL'
+ 	DELETE WHERE T.COL2='FINAL'
+  WHEN NOT MATCHED THEN
+    INSERT (ID,COL1,COL2) VALUES(S.ID,S.COL1,S.COL2)
+MERGE INTO TARGET_TABLE AS T USING (SELECT * FROM SOURCE_TABLE) AS S 
+  ON (T.ID = S.ID)
+  WHEN MATCHED THEN 
+ 	UPDATE SET T.COL1 = S.COL1 WHERE T.COL2<>'FINAL'
+ 	DELETE WHERE T.COL2='FINAL'
+  WHEN NOT MATCHED THEN
+    INSERT (ID,COL1,COL2) VALUES(S.ID,S.COL1,S.COL2)    
+"
+
 "Commands (DML)","RUNSCRIPT","
 RUNSCRIPT FROM fileNameString scriptCompressionEncryption
 [ CHARSET charsetString ]