ALTER TABLE t1 ADD COLUMN ts TIMESTAMP(6) GENERATED ALWAYS AS ROW START, ADD COLUMN te TIMESTAMP(6) GENERATED ALWAYS AS ROW END, ADD PERIOD FOR SYSTEM_TIME(ts, te), ADD SYSTEM VERSIONING; 1. 2. 3. 4. 二、查询历史数据 这里我们做一个实验,首先要插入1条数据,如下图所示: MariaDB10.3 ...
ADD COLUMN wing_id CHAR(2) AFTER family_id; 1. 2. 若想将新列加在最前面,要用FIRST,而不是AFTER。FIRST后不需要带列名。 增加新列并修改common_name的类型长度 ALTER TABLE birds_new ADD COLUMN body_id CHAR(2) AFTER wing_id, ADD COLUMN bill_id CHAR(2) AFTER body_id, ADD COLUMN endangered...
drop table 表名; #删除一个表 3.4 修改表 (1)重命名表:alter table 旧表名 rename 新表名; (2)向表中添加一列:alter table 表名 add 要添加的列名 数据类型; (3)删除表中的一列:alert table 表名 drop column 被删的列名; (4)修改一个列的数据类型:alter table 表名 modify column 列名 数据类...
column 所配置的表中需要同步的列名集合,使用JSON的数组描述字段信息 。默认使用所有列配置,例如[ * ]。 支持列裁剪:可以挑选部分列进行导出。 支持列换序:列可以不按照表schema信息顺序进行导出。 支持常量配置:您需要按照MariaDB SQL语法格式,例如["id","table","1","'mingya.wmy'","'null'","to_char(...
ERROR 1815 (HY000): Internal error: IDB-1002: 't1' and 't2' have incompatible column type specified for join condition. 4、alter不支持change/modify更改字段属性 MariaDB [test]> alter table t1 change id id bigint; ERROR 1815 (HY000): Internal error: CAL0001: Alter table Failed: Changing ...
Instant ADD COLUMN for InnoDBContents Limitations Example See Also Normally, adding a column to a table requires the full table to be rebuilt. The complexity of the operation is proportional to the size of the table, or O(n·m) where n is the number of rows in the table and m is the...
ALTER TABLE `ExampleTable` ADD COLUMN `DOB` DATE AS (DATE_SUB (`DateExpected`, INTERVAL `Age` WEEKS)) STORED; 我想从DateExpected和Age值计算出生日期。 从创建表: `DateExpected` date DEFAULT NULL, `Age` int(11) DEFAULT NULL, Substituting with: ...
MariaDB [test]> alter table t1 change id id bigint; ERROR 1815 (HY000): Internal error: CAL0001: Alter table Failed: Changing the datatype of a column is not supported 建表范例 CREATE TABLE `sbtest` ( `id` int(10) unsigned NOT NULL, ...
MariaDB [bi]> alter table new biame as test; (2)添加字段(无任何属性) MariaDB [bi]> alter table test add column id int;(column可省) MariaDB [bi]> alter table test add id int; (3)添加字段,同时为添加的字段设定相应的约束 MariaDB [bi]> alter table test add age int not null defau...
create [temporary] table [if not exists] tbl_name 修改表: alter [online|offline] [ignore] table tbl_name 字段: 添加:add [column] col_name column_definition 删除:drop [column] col_name 修改:change [column] old_col_name new_col_name column_definition ...