Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_30923 ( "Stage" real, "Winner" text, "General classification" text, "Mountains Classification" text, "Points classification" text, "Sprints Classification" text, "Team Classification" text )

### Question ###
Name the points classification for levi leipheimer

### Accurate SQL ###

SELECT "Points classification" FROM table_30923 WHERE "General classification" = 'Levi Leipheimer'