Question

我正在进行查询以恢复我们在苏格兰居住的客户的所有电子邮件地址目前邮政编码专栏的全长邮政编码为'YO7 4LL'

以下是试图使用的查询

SELECT cast(left(postcode) as varchar),email
from dbo.SubscriberList
WHERE Postcode  in (
'AB1','AB2','AB23','AB3','AB30','AB31','AB32','AB33','AB34','AB35','AB36','AB41',
'AB42','AB43','AB44','AB45','AB51','AB52','AB53','AB54','AB55','DD10','DD9',
'FK17','G82','G83','G84','PA20','PA21','PA22','PA23','PA24','PA25','PA26','PA27',
'PA28','PA29','PA30','PA31','PA32','PA33','PA34','PA35','PA36','PA37','PA38','PA41',
'PA42','PA43','PA44','PA45','PA46','PA47','PA48','PA49','PA60','PA61','PA62','PA63',
'PA64','PA65','PA66','PA67','PA68','PA70','PA71','PA72','PA73','PA74','PA75','PA76',
'PA77','PA78','DG7','KA1','KA10','KA11','KA12','KA13','KA14','KA15','KA16','KA17',
'KA18','KA19','KA2',
'KA20','KA21','KA22','KA23','KA24','KA25','KA26','KA27','KA28','KA29','KA3','KA30','KA4',
'KA5','KA6','KA7','KA8','KA9','PA17','FK10','FK11','FK12','FK13','FK14',
'DG1','DG10','DG11','DG12','DG13','DG14','DG16','DG2','DG3','DG4','DG5',
'DG6','DG7','DG8','DG9','KA6','ML12',
'G60','G61','G62','G64','G65','G66','G81','G82','G83','DD1','DD2','DD3','DD5',
'EH21','EH22','EH31','EH32','EH33','EH34','EH35','EH36','EH39','EH40',
'EH41','EH42','TD13','EH1','EH10','EH12','EH13','EH14','EH15','EH16','EH17',
'EH2','EH20','EH21','EH28','EH29','EH3','EH30','EH4','EH5','EH6','EH7','EH8','EH9',
'FK1','FK10','FK11','FK12','FK13','FK14','FK15','FK16','FK17','FK18','FK19','FK2',
'FK20','FK21','FK3','FK4','FK5','FK6','FK7','FK8','FK9',
'DD6','FK10','KY1','KY10','KY11','KY12','KY13','KY14','KY15','KY16','KY2',
'KY3','KY4','KY5','KY6','KY7','KY8','KY9',
'G1','G11','G12','G14','G15','G2','G20','G21','G32','G41','G43','G45','G51','G53','G76',
'AB37','IV1','IV10','IV11','IV12','IV13','IV14','IV15','IV16','IV17','IV18','IV19',
'IV2','IV20','IV21','IV22','IV23','IV24','IV25','IV26','IV27','IV28','IV3','IV4','IV40',
'IV41','IV42','IV43','IV44','IV45','IV46','IV47','IV48','IV49',
'IV5','IV51','IV52','IV53','IV54','IV55','IV56','IV6','IV7','IV8','IV9','KW1',
'KW10','KW11','KW12','KW13','KW14','KW2','KW3','KW5','KW6','KW7','KW8','KW9','PA34',
'PA38','PA39','PA40','PH19','PH20','PH21','PH22','PH23','PH24','PH25',
'PH26','PH30','PH31','PH32','PH33','PH34','PH35','PH36','PH37','PH38','PH39',
'PH40','PH41','PH42','PH43','PH44',
'PA10','PA11','PA13','PA14','PA16','PA18','PA19',
'EH46','EH55','G33','G65','G66','G67','G68','G69','G71','G72','G73','G74','G75','ML1',
'ML10','ML11','ML12','ML2','ML3','ML4','ML5','ML6','ML7','ML8','ML9',
'EH10','EH18','EH19','EH20','EH22','EH23','EH24','EH25','EH26','EH37','EH46',
'AB37','AB38','AB56','IV30','IV31','IV32','IV36','PH26',
'KW1','KW15','KW16','KW17',
'DD2','FK14','FK15','FK19','FK21','KY13','PH1','PH10','PH11','PH12','PH13','PH14','PH15',
'PH16','PH17','PH18','PH2','PH3','PH4','PH5','PH6','PH7','PH8','PH9',
'PA1','PA10','PA11','PA12','PA14','PA3','PA4','PA5','PA6','PA7','PA8','PA9',
'EH26','EH38','EH43','EH44','EH45','EH46','ML12','TD1','TD10','TD11','TD12','TD13','TD14',
'TD15','TD2','TD3','TD4','TD5','TD6','TD7','TD8','TD9',
'ZE1','ZE2','ZE3','FK15','FK16','FK17','FK18','FK19','FK20','FK21','FK6','FK7','FK8','FK9','G63',
'EH27','EH30','EH47','EH48','EH49','EH52','EH53','EH54',
'EH55','HS1','HS2','HS3','HS4','HS5','HS6','HS7','HS8','HS9'
)

我知道我不能使用'IN'我应该使用'喜欢'或其他东西我还想过可能会连接postcode列并放在临时表中来运行查询。

关于如何运行这个的任何想法将非常感激。感谢

Answer 1

将此分为两个条件：

WHERE left(Postcode, 3)  in (<constants with 3 characters>) or
      left(Postcode, 4) in (<constants with 4 characters>)

或者，使用所有值创建一个表格，例如ScotlandPostPrefixes。然后，您可以使用join作为条件。您甚至可以使用索引通过以下技巧快速实现此目的：

from table t left outer join
     ScotlandPostPrefixes spp3
     on left(Postcode, 3) = spp3.Prefix left outer join
     ScotlandPostPrefixes spp4
     on left(Postcode, 4) = spp4.Prefix 
where spp3.Prefix is not null or spp4.Prefix is not null

这看起来更复杂，但它实际上会利用ScotlandPostPrefixes(Prefix)上的索引进行处理。

Sql查询使用前3个字符进行邮政编码搜索

1 个答案: