SQL 选择将状态名称转换为缩写

Question

在 SQL select 语句中，如何将完整的状态名称转换为状态缩写（New York例如NY）？如果可能的话，我想在没有连接的情况下执行此操作。看起来会是什么样子regexp_replace？

select regexp_replace(table.state, 'New York', 'NY', 'g') as state
这种方法可以为所有州集体实施吗？

有关州名称和缩写的参考列表：https://gist.github.com/esfand/9443427。

Answer 1

如果需要的话，这里是原始的 WHEN/THEN 形式，以及加拿大各省：

CASE "YOUR COLUMN CONTAINING FULL STATE NAMES"
WHEN 'Alabama' THEN 'AL' 
WHEN 'Alaska' THEN 'AK' 
WHEN 'Arizona' THEN 'AZ' 
WHEN 'Arkansas' THEN 'AR' 
WHEN 'California' THEN 'CA' 
WHEN 'Colorado' THEN 'CO' 
WHEN 'Connecticut' THEN 'CT' 
WHEN 'Delaware' THEN 'DE' 
WHEN 'District of Columbia' THEN 'DC' 
WHEN 'Florida' THEN 'FL' 
WHEN 'Georgia' THEN 'GA' 
WHEN 'Hawaii' THEN 'HI' 
WHEN 'Idaho' THEN 'ID' 
WHEN 'Illinois' THEN 'IL' 
WHEN 'Indiana' THEN 'IN' 
WHEN 'Iowa' THEN 'IA' 
WHEN 'Kansas' THEN 'KS' 
WHEN 'Kentucky' THEN 'KY' 
WHEN 'Louisiana' THEN 'LA' 
WHEN 'Maine' THEN 'ME' 
WHEN 'Maryland' THEN 'MD' 
WHEN 'Massachusetts' THEN 'MA' 
WHEN 'Michigan' THEN 'MI' 
WHEN 'Minnesota' THEN 'MN' 
WHEN 'Mississippi' THEN 'MS' 
WHEN 'Missouri' THEN 'MO' 
WHEN 'Montana' THEN 'MT' 
WHEN 'Nebraska' THEN 'NE' 
WHEN 'Nevada' THEN 'NV' 
WHEN 'New Hampshire' THEN 'NH' 
WHEN 'New Jersey' THEN 'NJ' 
WHEN 'New Mexico' THEN 'NM' 
WHEN 'New York' THEN 'NY' 
WHEN 'North Carolina' THEN 'NC' 
WHEN 'North Dakota' THEN 'ND' 
WHEN 'Ohio' THEN 'OH' 
WHEN 'Oklahoma' THEN 'OK' 
WHEN 'Oregon' THEN 'OR' 
WHEN 'Pennsylvania' THEN 'PA' 
WHEN 'Rhode Island' THEN 'RI' 
WHEN 'South Carolina' THEN 'SC' 
WHEN 'South Dakota' THEN 'SD' 
WHEN 'Tennessee' THEN 'TN' 
WHEN 'Texas' THEN 'TX' 
WHEN 'Utah' THEN 'UT' 
WHEN 'Vermont' THEN 'VT' 
WHEN 'Virginia' THEN 'VA' 
WHEN 'Washington' THEN 'WA' 
WHEN 'West Virginia' THEN 'WV' 
WHEN 'Wisconsin' THEN 'WI' 
WHEN 'Wyoming' THEN 'WY' 
WHEN 'Alberta' THEN 'AB' 
WHEN 'British Columbia' THEN 'BC' 
WHEN 'Manitoba' THEN 'MB' 
WHEN 'New Brunswick' THEN 'NB' 
WHEN 'Newfoundland and Labrador' THEN 'NL' 
WHEN 'Northwest Territories' THEN 'NT' 
WHEN 'Nova Scotia' THEN 'NS' 
WHEN 'Nunavut' THEN 'NU' 
WHEN 'Ontario' THEN 'ON' 
WHEN 'Prince Edward Island' THEN 'PE' 
WHEN 'Quebec' THEN 'QC' 
WHEN 'Saskatchewan' THEN 'SK' 
WHEN 'Yukon Territory' THEN 'YT' 
    ELSE NULL
END