rpm-e--nodeps mysql-community-libs-8.0.13-1.el6.i686 #有则卸载 #将/var/lib/mysql文件夹下的所有文件都删除干净。 Step2、传安装文件到 linux 系统进行安装: #出于安全问题,建议使用 md5sum 命令核对一下文件源: md5sum mysql-5.7.24-linux-glibc2.12-i686.tar.gz mkdir/usr/local/msyql #/usr/local ...
#备份所有库-F刷新BINLOGmysql-uroot-p12345-Smysql.sock--defalut-character-set=utf8--single--transaction-F-A|gzip>/backup/mysql.bak.sql.gz #备份一个库 mysql-uroot-p12345-Smysql.sock-F-Bstudent|gzip>/backup/mysql.bak.sql.gz 注意:因为-single-transaction选项备份时涉及到的是select语句,所以dml...
Table: CREATE TABLE `t` ( `a` varchar(10) CHARACTER SET gbk DEFAULT NULL, `b` char(2) CHARACTER SET gbk DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 1 row in set (0.00 sec) ERROR: No query specified (root@localhost) [python]> alter table t add column c varchar(11); Qu...
VARCHARACTER (R) VARIABLES VARYING (R) VIEW VIRTUAL[ae] (R) WAIT WARNINGS WEEK WEIGHT_STRING WHEN (R) WHERE (R) WHILE (R) WITH (R) WITHOUT[af] WORK WRAPPER WRITE (R) X509 XA XID[ag] XML XOR (R) YEAR YEAR_MONTH (R) ZEROFILL (R) [a] ACCOUNT: added in 5.7.6 (nonreserved...
character-set-server=utf8 # 创建新表时将使用的默认存储引擎 default-storage-engine=INNODB # 默认使用“mysql_native_password”插件认证 #mysql_native_password default_authentication_plugin=mysql_native_password [mysql] # 设置mysql客户端默认字符集 ...
aggregate_stats_from() : PFS_host, PFS_useraggregate_status() : PFS_account, PFS_host, PFS_useraggregate_status_stats() : PFS_connection_sliceaggregate_string_properties() : Itemaggregate_temporal_properties() : Itemaggregate_thread_status : PSI_thread_service_v4, PSI_thread_service_v5, PSI...
The back-end representation of a GUID type was changed from BINARY(16) to CHAR(36). This was done to allow developers to use the server function UUID() to populate a GUID table - UUID() generates a 36-character string. Developers of older applications can add 'Old Guids=true' to the...
ALTER DATABASE 库名 DEFAULT CHARACTER SET 编码格式 DEFAULT COLLATE 排序规则:修改数据库的编码格式、排序规则。 1.3、MySQL表相关的命令 对于MySQL表相关的命令,首先来聊一聊创建表的SQL命令,如下: CREATE TABLE `库名`.`表名` ( 字段名称1 数据类型(精度限制) [字段选项], 字段名称2 数据类型(精度限制) ...
err.sql: String, contains the full SQL of the failed query. This can be useful when using a higher level interface like an ORM that is generating the queries. err.sqlState: String, contains the five-character SQLSTATE value. Only populated from MySQL server error. err.sqlMessage: String,...
其原理就是将索引先按照从first_name中提取的关键字排序,如果无法确定先后再按照从last_name提取的关键字排序,也就是说该索引表只是按照记录的first_name字段值有序。 因此select * from person where first_name = ?是可以利用索引的,而select * from person where last_name = ?无法利用索引。 那么该复合索引...