在SQL Select Index中編制索引

Question

目前有一個腳本可以像這樣選擇一年中的前5個月。

... 
;WITH months AS 
(
    -- we need 5 months 
    SELECT TOP (5) m = number FROM master.dbo.spt_values 
    WHERE type = 'P' ORDER BY number 
), 
-- we need a week in each month, starting at the 1st 
weeks AS (SELECT w FROM (VALUES(0),(1),(2),(3)) AS w(w)), 
dates AS 
(
    -- this produces a date for the first 4 weeks of each 
    -- month from the start date 
    SELECT d = DATEADD(WEEK,w.w,DATEADD(MONTH,m.m,@start)) 
    FROM months AS m CROSS JOIN weeks AS w 
), 
... 

我該如何修改此腳本只需要1,2,4,5個月。

Answer 1

FROM months AS m CROSS JOIN weeks AS w 
WHERE m.m IN (0,1,3,4)