SQL Server query In clause - sql-server

Question

I have a SQL Server query which is supposed to select those first week and third week login to our portal but didn't login at second week. My problem is, the query below taking about 15 secs to be loaded. Is there any faster way or any problem on my query ?
select
count(distinct id )
from
table_x
where
g in (319, 329)
and enable = 1
and Date between '2016-01-18' and '2016-01-24' --Third Week
and id in (select distinct id
from table_x
where g in (319, 329)
and enable = 1
and Date between '2016-01-05' and '2016-01-11' --First Week
and id not in (select distinct id
from table_x
where g in (319, 329)
and enable = 1
and Date between '2016-01-11' and '2016-01-17' --Second Week
)
)

Answer 1

Try using conditional aggregates (a single where clause and summing 3 case expressions) instead of multiple passes through the table.
SELECT
COUNT(*)
FROM (
SELECT
user_id
, SUM(CASE WHEN [Date] BETWEEN '2016-01-18' AND '2016-01-24' THEN 1 ELSE 0 END) [ThirdWeek]
, SUM(CASE WHEN [Date] BETWEEN '2016-01-11' AND '2016-01-17' THEN 1 ELSE 0 END) [SecondWeek]
, SUM(CASE WHEN [Date] BETWEEN '2016-01-05' AND '2016-01-11' THEN 1 ELSE 0 END) [FirstWeek]
FROM table_x
WHERE x1.g IN (319, 329)
AND x1.enable = 1
AND x1.[Date] BETWEEN '2016-01-05' AND '2016-01-24'
GROUP BY
user_id
) d
WHERE [FirstWeek] > 0
AND [ThirdWeek] > 0
AND [SecondWeek] = 0
While I would expect the above to be a good option, perhaps use of EXISTS/NOT EXISTS could help, note you do NOT need distinct in the following example.
SELECT
COUNT(DISTINCT user_id)
FROM table_x x1
WHERE x1.g IN (319, 329)
AND x1.enable = 1
AND x1.[Date] BETWEEN '2016-01-18' AND '2016-01-24' --Third Week
AND EXISTS (
SELECT
NULL
FROM table_x
WHERE g IN (319, 329)
AND enable = 1
AND Date BETWEEN '2016-01-05' AND '2016-01-11' --First Week
AND x1.user_id = table_x.user_id
)
AND NOT EXISTS (
SELECT
NULL
FROM table_x
WHERE g IN (319, 329)
AND enable = 1
AND Date BETWEEN '2016-01-11' AND '2016-01-17' --Second Week
AND x1.user_id = table_x.user_id
)
;