問題描述
是否可以僅使用 TSQL 來檢查 varchar 字段的前兩個字符是否按字母順序排列?
Is it possible, just using TSQL, to check if the first two characters of a varchar field are alphabetical?
我需要從 my_table 中只選擇 my_field 以兩個字母字符開頭的行.我怎樣才能做到這一點?
I need to select from my_table only the rows having my_field beginning with two alphabetical chars. How can I achieve this?
是否可以使用正則表達式?
Is it possible to use a regex?
推薦答案
你不需要使用正則表達式，LIKE 就足夠了:
You don't need to use regex, LIKE is sufficient:
WHERE my_field LIKE '[a-zA-Z][a-zA-Z]%'
假設字母順序"僅指拉丁字符，而不是 Unicode 中按字母順序分類的任何字符.
Assuming that by "alphabetical" you mean only latin characters, not anything classified as alphabetical in Unicode.
注意 - 如果您的排序規(guī)則區(qū)分大小寫，則將范圍指定為 [a-zA-Z] 很重要.[a-z] 可以排除 A 或 Z.[A-Z] 可以排除 a 或 z.
Note - if your collation is case sensitive, it's important to specify the range as [a-zA-Z]. [a-z] may exclude A or Z. [A-Z] may exclude a or z.
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