补齐SQL查询结果中缺失的日期

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补齐SQL查询结果中缺失的日期（按天）

-- 按月补齐天数
SELECT DAY.DATE_STR,SALE_SEG_NUM
from
(
SELECT
 TO_CHAR (
  TO_DATE ('2014-03-01', 'yyyy-mm-dd') + LEVEL - 1,
  'yyyy-mm-dd'
 ) AS DATE_STR
FROM
 dual CONNECT BY LEVEL <= TO_DATE ('2014-04-01', 'yyyy-mm-dd') - TO_DATE ('2014-03-01', 'yyyy-mm-dd')
) DAY
LEFT OUTER JOIN
(
SELECT
 TO_CHAR (
  T .out_tkt_time,
  'yyyy-MM-dd'
 ) AS DATE_STR,
COUNT (T .TICKET_ID) AS SALE_SEG_NUM
FROM
 ticket_info T
WHERE TO_CHAR (T .out_tkt_time, 'yyyy-MM') = '2014-03'
GROUP BY
 TO_CHAR (
  T .out_tkt_time,
  'yyyy-MM-dd'
 )
order BY
 TO_CHAR (
  T .out_tkt_time,
  'yyyy-MM-dd'
 )
)RESULT  ON DAY.DATE_STR = RESULT.DATE_STR
ORDER BY DAY.DATE_STR

 

转载于:https://my.oschina.net/wamdy/blog/210251