odps-ddl: add page

Change-Id: I75366bdb9f6c96136c4838c6961159418a77dae7

pages/common/odps-sql.md

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+# odps ddl
+
+> Run ddl task in odps.
+
+- Create a table with partition and lifecycle:
+
+`create table {{table_name}} ({{col}} {{type}}) partitioned by ({{col}} {{type}}) lifecycle {{days}};`
+
+- Create a table based on the definition of another table:
+
+`create table {{table_name}} like {{another_table}};`
+
+- Add parition to a table:
+
+`alter table {{table_name}} add parition ({{partition_spec}});`
+
+- Delete partition from a table:
+
+`alter table {{table_name}} drop partition ({{partition_spec}});`
+
+- Delete table:
+
+`drop table {{table_name}};`