这句SQL应该怎么改才正确？

Question

CREATE TABLE t_valid_train_fea AS
SELECT
tb1.user_id
,tb1.item_id
,tb1.time
,CASE
WHEN tb2.label IS NOT NULL THEN tb2.label
ELSE 0
END AS label
,feature
FROM
(select * from tfea_ui_count where tb1.time='2014-12-17') tb1
LEFT OUTER JOIN t_label_valid_train tb2
ON tb1.user_id=tb2.user_id AND tb1.item_id=tb2.item_id;

Answer 1

创建视图应该是 CREATE VIEW 啊。