SQL Server中的模式匹配
SQL Server Books Online上面搜索like,找到了包含%，_,[],[^]几个通配符。
如：select * from mybbs where Content like [w]%
like关键字用于搜索匹配某个模式的字符串，或者日期，时间值。
SQL Server Books中的部分解释如下：
Pattern Matching in Search Conditions
The LIKE keyword uses a regular expression to contain the pattern that the values are matched against. The pattern contains the character string to search for, which can contain any combination of four wildcards.
| Wildcard | Meaning |
|---|---|
| % | Any string of zero or more characters. |
| _ | Any single character. |
| [ ] | Any single character within the specified range (for example, [a-f]) or set (for example, [abcdef]). |
| [^] | Any single character not within the specified range (for example, [^a - f]) or set (for example, [^abcdef]). |
Enclose the wildcard(s) and the character string in single quotation marks, for example:
- LIKE %en% searches for all strings that contain the letters en anywhere in the string (Bennet, Green, McBadden).
- LIKE _heryl searches for all six-letter names ending with the letters heryl (Cheryl, Sheryl).
- LIKE [CK]ars[eo]n searches for Carsen, Karsen, Carson, and Karson (Carson).
- LIKE [M-Z]inger searches for all names ending with the letters inger that begin with any single letter from M through Z (Ringer).
- LIKE M[^c]% searches for all names beginning with the letter M that do not have the letter c as the second letter (MacFeather).
This query finds all phone numbers in the authors table that have area code 415:
SELECT phone
FROM pubs.dbo.authors
WHERE phone LIKE 415%
