SELECT field from table WHERE a field like condition

SELECT field from table WHERE a field like condition
With regard to conditions, SQL provides four matching modes:

1,%: Represents any 0 or more characters.  Can match any type and length of characters, in some cases in Chinese, please use two percent sign (%).  For example, SELECT * from [user] WHERE u_name like '% Three ', will be u_name as "John", "Zhang Cat Three", "three-legged Cat", "Tang Sanzang" and so on Have "three" records all find out. In addition, if you need to find a record in u_name that has both "three" and "cat", use the AND condition, select * FROM [user] WHERE u_name like '% three ' and u_name like '% cat ', if you use SELECT * From [user] WHERE u_name is like '% of cat% ' although it can search out "three-legged cat", but can not search out the conditions of the "cat three".

2,_: Represents any single character. Matches a single arbitrary character, which is used to restrict the character-length statements of an expression: for example, select * from [user] WHERE u_name like ' _ three _ ' Only find "Tang Sanzang" so U_name is three words and the middle one is "three"; From [user] WHERE u_name like ' three __ '; Only find "three-legged cat" so name is three words and the first word is "three".

3,[]: Represents one of the characters listed in parentheses (similar to a regular expression).  Specifies a character, string, or range, which requires that the matched objects be any of them. For example, SELECT * from [user] WHERE u_name like ' [Zhang Li Wang] III ' will find "John", "Lie Triple Systems", "Wang San" (not "Zhangli Kang"), such as a series of characters in [] (01234, ABCDE, etc.) can be slightly written as "0-4", " A-e "SELECT * from [user] WHERE u_name like ' old [1-9] ', will find" Old 1 "," Old 2 "、......、" Old 9 ".

4,[^]: Represents a single character that is not listed within the parentheses.  The value and [] are the same, but it requires that the matched object be any character other than the specified character. For example, select * from [user] where u_name like ' [^ Zhang Li Wang] III ' will find out not the surname "Zhang", "Li", "Wang" "Zhao Three", "Sun San", etc. select * from [user] where u_name like ' old [^1-4] ' will exclude "old 1" to "Old 4", Looking for "old 5", "Old 6" 、......

5, the query contains wildcard characters, because of the wildcard character, cause we query special characters "%", "_", "[" statement can not be implemented normally, and special characters with "[]" around the normal query. Accordingly we write the following functions: function Sqlencode (str) str=replace (str, "[", "[[]") ' This sentence must be in the front str=replace (str, "_", "[_]") Str=replace (str, "%", "[%]") The Sqlencode=str End Function processes the search string before the query.