case when then...else end sql Óï¾äÓ÷¨
select f.AGENTID as 'ID',
f.AGENTNAME as 'ÐÕÃû',
f.COMNAME as '¹«Ë¾¼ò³Æ',
c.REGISTDATE as '×¢²áʱ¼ä',
c.VALIDDATE as '½ØÖÁʱ¼ä',
c.DISTRICT as 'ÇøÏØ',
c.COMAREA as '¸ºÔðÇøÓò',
c.category as 'µÈ¼¶',
case when c.agentcardflag = 1 then '´ýÉóºË'
when c.agentcardflag = 2 then 'ÉóºËͨ¹ý'
when c.agentcardflag = 3 then 'δͨ¹ý'
else 'δͨ¹ý'
end as 'Éí·ÝÉóºË״̬'
from MagentInf f ,MagentCon c where c.AGENTID = f.AGENTID and c.Ispay = 0
ÏÂÃæÎª×ªÔØ
SELECT
CASE WHEN USERID=10 THEN 'ÉçÇøÓû§£º'+SELECT NAME from(SELECT NAME from USER_INFO UI WHERE UI.[ID]=A.USERID)
WHEN USERID=20 THEN '×¢²áÓû§£º'+SELECT NAME from(SELECT NAME from REGISTER_INFO UI WHERE UI.[ID]=A.USERID)
WHEN UERID=30 THEN 'ÆÕͨÓû§£º'+SELECT NAME from(SELECT NAME from SIMPLE_INFO UI WHERE UI.[ID]=A.USERID)
--.....»¹Óкü¸¸öWHEN
ELSE '' END,
A.TITLE,A.TETENT
from BASICINFO A
Ïà¹ØÎĵµ£º
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±È·½ËµÔÚÒ»¸ö×Ö¶ÎÀïÃæÌí¼ÓÒ»¸öboolean µÄ×ֶε±ÄãÒª´¦Àí¸Ã×ֶεÄʱºò¾Í True ÄÄô±ðµÄÈ˶¼²»¿ÉÒÔ½øÐвÙ×÷
¡¡Èç¹ûÊÇFalse ÄÄô¾Í¿ÉÒÔ½øÐвÙ×÷¡«¡«ºÇ¿É¡«¡«ÎÒÊÇÕâÑùµÄ
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¡¡SQLËø»úÖÆ
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ĬÈϵÄÊÂÎñ¸ôÀë¼ ......
--²éѯӦÓóÌÐòµÄµÈ´ý
SELECT TOP 10
wait_type,waiting_tasks_count AS tasks,
wait_time_ms,max_wait_time_ms AS max_wait,
signal_wait_time_ms AS signal
from sys.dm_os_wait_stats
ORDER BY wait_time_ms DESC
--²éѯÔÚÈÎһʱ¿ÌËùÓÐÊÚȨ¸øµ±Ç°Ö´ÐÐÊÂÎñ»òµ±Ç°Ö´ÐÐÊÂÎñµÈ´ýµÄËø
SELECT
request_session_id A ......
inner join(µÈÖµÁ¬½Ó) Ö»·µ»ØÁ½¸ö±íÖÐÁª½á×Ö¶ÎÏàµÈµÄÐÐ
left join(×óÁª½Ó) ·µ»Ø°üÀ¨×ó±íÖеÄËùÓмǼºÍÓÒ±íÖÐÁª½á×Ö¶ÎÏàµÈµÄ¼Ç¼
right join(ÓÒÁª½Ó) ·µ»Ø°üÀ¨ÓÒ±íÖеÄËùÓмǼºÍ×ó±íÖÐÁª½á×Ö¶ÎÏàµÈµÄ¼Ç¼
INNER JOIN Óï·¨£º
INNER JOIN Á¬½ÓÁ½¸öÊý¾Ý±íµÄÓ÷¨£º
SELECT * from ±í1 INNER JOIN ±í2 ON ±í1.×ֶκÅ=±í2 ......
1.JOINºÍUNIONÇø±ð
join ÊÇÁ½Õűí×ö½»Á¬ºóÀïÃæÌõ¼þÏàͬµÄ²¿·Ö¼Ç¼²úÉúÒ»¸ö¼Ç¼¼¯£¬
unionÊDzúÉúµÄÁ½¸ö¼Ç¼¼¯(×Ö¶ÎÒªÒ»ÑùµÄ)²¢ÔÚÒ»Æð£¬³ÉΪһ¸öеļǼ¼¯ ¡£
JOINÓÃÓÚ°´ÕÕONÌõ¼þÁª½ÓÁ½¸ö±í£¬Ö÷ÒªÓÐËÄÖÖ£º
INNER JOIN£ºÄÚ²¿Áª½ÓÁ½¸ö±íÖеļǼ£¬½öµ±ÖÁÉÙÓÐÒ»¸öͬÊôÓÚÁ½±íµÄÐзûºÏÁª½ÓÌõ¼þʱ£¬ÄÚÁª½Ó²Å·µ»ØÐС£ÎÒÀí½âµÄ ......
BackupEveryDay
ÿÌì½øÐÐÊý¾Ý¿âµÄ²îÒ챸·Ý
day
Declare @File Varchar(2000)
Set @File='E:\Databasebackup\njyc_data_diff.BAK'
Backup database njyc_data to Disk=@File with DIFFERENTIAL
WeekBackup
ÿÖܽøÐÐÒ»´ÎÊý¾Ý¿âµÄÍêÈ«±¸·Ý£¬±¸·ÝÎļþÃûΪµ±ÌìÈÕÆÚ £¨njyc_data_Äê_ÔÂ_ÈÕ£©
BackupAll
DECLARE @BackupFi ......