A PRIMARY KEY must include all columns in the table's partitioning function:这样的话判断主键是否唯一就可以在单个分区内部完成,否则就需要跨所有的分区 MAXVALUE can only be used in last partition definition:RANGE表分区后不能带MAXVALUE分区,否则无法增加分区。或者就只能重新分区了 alter table access_log ...
5. 只有RANG和LIST分区能进行子分区,HASH和KEY分区不能进行子分区。 6. 临时表不能被分区。 四、 获取mysql分区表信息的几种方法 1. show create table 表名 可以查看创建分区表的create语句 2. show table status 可以查看表是不是分区表 3. 查看information_schema.partitions表 select partition_name part, ...
SELECTa.column1,b.column2FROMtable_name aJOINtable_name bONa.id=b.parent_id; 多级递归查询:MySQL 8.0+支持使用WITH RECURSIVE实现多级递归查询,简化层级数据处理。 代码语言:sql AI代码解释 WITHRECURSIVE SubDepartmentsAS(SELECTid,name,parent_idFROMdepartmentsWHEREparent_id=1-- 假设1是顶级部门的IDUNIONAL...
列层级:列权限适用于一个给定表中的单一列,mysql.columns_priv 当使用REVOKE时,您必须指定与被授权列相同的列。 -- 权限列表 ALL [PRIVILEGES] -- 设置除GRANT OPTION之外的所有简单权限 ALTER -- 允许使用ALTER TABLE ALTER ROUTINE -- 更改或取消已存储的子程序 CREATE -- 允许使用CREATE TABLE CREATE ROUTIN...
MySQL的dd表是用来存放表结构和各种建表信息的,客户端建的表都存在mysql.table和mysql.columns表里,还有一个表mysql.column_type_elements比较特殊,用来存放SET和ENUM类型的字段集合值信息。看一下下面这张表的mysql.columns表和mysql.column_type_elements信息。为了缩短显示长度,这里只展示几个重要的值。
-- 语法create table <table> (// 字段) ENGINE=数据库引擎 DEFAULT CHARSET=utf8 AUTO_INCREMENT=1partition by LIST (分区字段或者基于该字段的返回的整数值的表达式) ( partition <分区名称> values IN (Value1，Value2, Value3), ... partition <分区名称> values IN (Value4, Value5),);columns分区...
9999-12-31', job_code INT, store_id int ) PARTITIONBY LIST(store_id) ( PARTITIONpNorth VALUES IN (1,), PARTITION pEast VALUES IN (2,4)) #ERROR 1503 (HY000): A PRIMARY KEYmust include all columns in the table's partitioning function 3.2、list列表多字段表分区 01 02...
How to list all tables that contain a specific column name in MySQL? You want to look for tables using the name of columns in them. SELECT DISTINCT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME IN('column1', 'column2') AND TABLE_SCHEMA = 'schema_name'; Or a more ...
The world's most popular open source database Contact MySQL|Login|Register HeatWave Use automated and integrated generative AI and machine learning (ML) in one cloud service for transactions and lakehouse scale analytics. Get faster insights from all your data with unmatched performance and deploy ap...
Hi All, I have a table with 20 columns in it. I need only 10 column names as row wise with alias names without their data. can some one help me Thanks Chandu Subject Written By Posted How to get few table columns instead of all columns in a table ...