(class) -- 索引 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; -- 查看表结构 DESCRIBE students; -- 或 SHOW COLUMNS FROM students; -- 修改表结构 ALTER TABLE students ADD COLUMN email VARCHAR(100); ALTER TABLE students MODIFY COLUMN name VARCHAR(100); ALTER TABLE students DROP COLUMN email; --...
show database 可用数据库中的列表 show tables 数据库内可用表的列表 show columns from customers 显示列 show status 用于显示广泛的服务器状态信息 show create database 显示创建特定数据库mysql语句 show create table 显示创建特定表的MySQL语句 show grants 显示授予用户(所有用户或特定用户)的安全权限 show err...
1mysql>use school; 进入school库2Database changed3mysql>show tables; 查看表 显示没有4Emptyset(0.00sec)56mysql> CREATE TABLE info(name varchar(50) notnull,age tinyint,sex varchar(6) notnull,salaryfloat);7Query OK,0rows affected (0.14sec)8创建一个叫info的表 名字 50个字符范围 不能空,年龄...
WITH [CASCADE|LOCAL] CHECK OPTION表示允许更新记录的条件,默认是CASCADE: LOCAL表示更新后的记录只要满足本视图的条件就可以更新。 CASCADE表示更新后的记录必须满足本视图关联的所有视图(包括创建本视图使用的视图)的条件才可以更新。 修改视图 ALTER[ALGORITHM={UNDEFINED|MERGE|TEMPTABLE}]VIEWviewname [(colname[, ...
OMS 社区版支持源端和目标端的字段数量不一致。全量迁移或增量同步过程中,如果报错源端表字段在目标端中不存在,您可以更新full-Import或Incr-Sync组件的参数ignoreRedunantColumnsReplicate为true后,恢复数据迁移项目的运行。 如果源端和目标端的表结构不完全一致,可能会出现数据不一致的情况。目前已知场景如下: ...
Deprecated List ►Modules ►Namespaces ►Concepts ▼Classes ►Class List Class Index ►Class Hierarchy ▼Class Members ►All ▼Functions _ a b c d e f g h i j k l m n o p q r s t u v w x y z ~ ►Variables ►Typedefs ►Enumerations ►Enumerator ►Related Funct...
Please notice thatthis command will build a list of queries you will have to execute to actually perform the conversion, meaning that you'll have to manually execute them afterwards. Convert the Collation of Table Columns The above command will change the Collation of all the tables, yet it ...
However, you can also specify that you want your columns to be nested below the table name like this: var options = {sql: '...', nestTables: true}; connection.query(options, function (error, results, fields) { if (error) throw error; /* results will be an array like this now: ...
For partitioned InnoDB tables, CHECK_TIME is always NULL. TABLE_COLLATION The table default collation. The output does not explicitly list the table default character set, but the collation name begins with the character set name. CHECKSUM The live checksum value, if any. CREATE_OPTIONS...
This affects only log files, not log tables, as the timestamp columns of the latter can be converted at will. --long-query-time=# Log all queries that have taken more than long_query_time seconds to execute to file. The argument will be treated as a decimal value with microsecond ...