A binary string is case-sensitive in comparisons. To compare the string as case-insensitive, convert it to a nonbinary string and useCOLLATEto name a case-insensitive collation: mysql>SET@s=BINARY'MySQL';mysql>SELECT@s='mysql';+---+|@s = 'mysql'|+---+|0|+---+mysql>SELECTCONVERT(...
- 校对(Collation)后缀简称会是case-sensitive, accent-sensitive, 或是kana-sensitive（或是同时都有）...
A binary string is case-sensitive in comparisons. To compare the string as case-insensitive, convert it to a nonbinary string and use COLLATE to name a case-insensitive collation: mysql> SET @s = BINARY 'MySQL'; mysql> SELECT @s = 'mysql'; +---+ | @s = 'mysql' | +---+...
MySQL- charSet: String- caseSensitive: boolean+compareStrings(str1:String, str2:String) : boolean 在上面的类图中,MySQL类包含一个charSet属性用于存储字符集,一个caseSensitive属性表示是否区分大小写,以及一个compareStrings方法用于比较字符串。 总结 MySQL在默认情况下不区分全角和半角字符,这对中文字符的处理尤...
utf8_general_ci 不区分大小写,这个你在注册用户名和邮箱的时候就要使用。utf8_general_cs 区分大小写,如果用户名和邮箱用这个 就会照成不良后果utf8_bin: compare strings by the binary value of each character in the string 将字符串每个字符串用二进制数据编译存储。 区分大小写,而且可 ...
Collation determines how string comparisons are executed, which affects how indexes are used in sorting and searching operations. For example, if your application requires case-insensitive searches, selecting a case-insensitive collation can be more efficient than using a case-sensitive one. However, ...
The BINARY collation/charset is not a character set, so there is no way to convert it directly to a string without loss. If you want to compare case-sensitively, then you really need to use a _cs variant of a character set for the TEXT column. Have you tried the latest nightly build...
From MySQL 3.23.4 on, to force aREGEXPcomparison to be case-sensitive, use theBINARYkeyword to make one of the strings a binary string. This query will match only lowercasebat the beginning of a name: mysql> SELECT * FROM pet WHERE name REGEXP BINARY "^b"; ...
You can force a case-sensitive sort for a column by using BINARY like so: ORDER BY BINARY col_name. The default sort order is ascending, with smallest values first. To sort in reverse (descending) order, add the DESC keyword to the name of the column you are sorting by: mysql> ...
The field has been declared with theBINARYattribute, which tells the server to compare strings byte-for-byte in a case-sensitive manner. ENUM_FLAG 0x0100 The field is anENUM. AUTO_INCREMENT_FLAG 0x0200 The field has been declared with theAUTO_INCREMENTattribute, which enables the automatic gen...