步骤三:执行修改字符集的SQL语句 修改为utf8mb3 -- 修改表的字符集为utf8mb3ALTERTABLEtable_nameCONVERTTOCHARACTERSETutf8mb3COLLATEutf8mb3_general_ci; 1. 2. 修改为utf8mb4 -- 修改表的字符集为utf8mb4ALTERTABLEtable_nameCONVERTTOCHARACTERSETutf8mb4COLLATEutf8mb4_general_ci; 1. 2. 结论 通过以上...
步骤1:创建数据库 CREATEDATABASEyour_database_nameCHARACTERSETutf8mb3COLLATEutf8mb3_general_ci; 1. CREATE DATABASE your_database_name: 创建一个名为your_database_name的数据库 CHARACTER SET utf8mb3: 设置数据库的字符集为utf8mb3 COLLATE utf8mb3_general_ci: 设置数据库的校对规则为utf8mb3_general_...
mysql> show create table t1\G *** 1. row *** Table: t1 Create Table: CREATE TABLE `t1` ( `a` char(10) CHARACTER SET utf8mb3 COLLATE utf8mb3_general_ci DEFAULT NULL, `b` varchar(10) CHARACTER SET latin2 COLLATE latin2_general_ci DEFAULT NULL, `c` char(10) COLLATE utf8mb4_...
问题的根因就是因为不同字符集下对于字符串尾巴后面的空格的处理方式不一样导致的。 代码语言:javascript 复制 --测试环境是下面这种(从5.7升级到8.x): information_schema>SELECT*FROMINFORMATION_SCHEMA.COLLATIONSWHERECHARACTER_SET_NAME='utf8mb3'andCOLLATION_NAME='utf8mb3_general_ci';+---+---+---+--...
With the COLLATE clause, you can override whatever the default collation is for a comparison. COLLATE may be used in various parts of SQL statements. Here are some examples: • With ORDER BY: SELECTkFROMt1ORDERBYk COLLATE latin1_german2_ci; ...
For example, to perform a case-insensitive search, use COLLATE with the INFORMATION_SCHEMA column name: mysql> SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME COLLATE utf8mb3_general_ci = 'test'; +---+ | SCHEMA_NAME | +---+ | test | +---+ mysql> SELECT SCHEMA...
前段时间,遇到一个mysql的问题,我仔细看看报错信息,应该是MySQL数据库报出来的,大意是说:collation不兼容,一个是 utf8mb4_0900_ai_ci,另一个是utf8mb4_general_ci。 utf8mb4_general_ci这玩意儿我见过,是针对utf8mb4编码的collation,但是utf8mb4_0900_ai_ci是啥,我也没见过。
CREATETABLEt(s1CHAR(1))CHARACTERSETutf8mb3;SELECT*FROMtWHEREs1COLLATEutf8mb3_general_ci='x';DECLARExVARCHAR(5)CHARACTERSETutf8mb3COLLATEutf8mb3_danish_ci;SELECTCAST('a'ASCHARCHARACTERSETutf8)COLLATEutf8_czech_ci; MySQL immediately converts instances ofutf8mb3in statements toutf8, so in statement...
utf8mb3:阉割过的utf8字符集,只使用1～3个字节表示字符。 utf8mb4:正宗的utf8字符集,使用1～4个字节表示字符。 有一点需要大家十分的注意,在MySQL中utf8是utf8mb3的别名,所以之后在MySQL中提到utf8就意味着使用1~3个字节来表示一个字符,如果大家有使用4字节编码一个字符的情况,比如存储一些emoji表情什么的,...