db = create_engine('sqlite:////'+os.path.join(config.SECRET_PATH, 'blog.db'))

metadata = MetaData(db)

blog = Table('blog', metadata, 
    Column('id', Integer, primary_key=True),
    Column('author', String),
    Column('subject', String),
    Column('entry', String),
    Column('slug', String, unique=True),
    Column('tags', String),
    Column('date', DateTime, default=func.current_timestamp()),
)

def getPagesBytag(tag):

    print select([blog], order_by=[desc(blog.c.date)], whereclause=(blog.c.tags.like("123")))#.execute()
    return select([blog], order_by=[desc(blog.c.date)], whereclause=(blog.c.tags.like(tag))).execute().fetchall()
___________
SELECT blog.id, blog.author, blog.subject, blog.entry, blog.slug, blog.tags, blog.date FROM blog WHERE blog.tags LIKE ? ORDER BY blog.date DESC []