添加表字段 alter table td_storage add EXAPROJECT VARCHAR(100); 1. 修改字段长度 db2 alter table eip_user alter column userpass set data type VARCHAR(40) 1. 将表中一列修改为自动增长时,可用下面命令: Alter table <table name> alter column <column name> set generated always as identity (start...
1、创建表:CREATE TABLE <TABLE_NAME>(COLUMN1 TYPE1,COLUMN2 TYPE2,...); 2、增加一列:CREATE TABLE <TABLE_NAME> ADD COLUMN <COLUMN_NAME> COL_TYPE; 3、删除一列:ALTER TABLE <TABLE_NAME> DROP COLUMN COLUMN_TYPE 4、删除语句的区别:ALTER TABLE ...ACTIVATE NOT LOGGED INITIALLY WITH EMPTY TAB...
1) Modifying the length & data type of column examples The following example uses the ALTER TABLE ALTER COLUMN statement to change the data type of the created_date column from DATE to TIMESTAMP: ALTER TABLE orders ALTER COLUMN created_date SET DATA TYPE TIMESTAMP; Code language: SQL (Struct...
主键(PRIMARY KEY)约束下字段长度的修改 如果 主键 列中包含下表中的字段类型,通过 ALTER TABLE table_name MODIFY/CHANGE COLUMN DDL 对该列进行字段长度修改操作,MySQL 数据库和OceanBase 数据库 MySQL 租户的区别如下。MySQL 数据... 没有约束的列修改长度 如果列中包含下表中的字段类型,通过 ALTER TABLE ...
alter table tm_zm_score modify column CREDIT_UP_DATE varchar(32); –移动表数据,从s2移动到tm_zm_watch_list_detail表,前提是两表的字段一致 insert into tm_zm_watch_list_detail select * from s2 ; –统计两张表的数据个数 select * from (select count(*) as c from tm_zm_watch_list_detail...
To change a version of a function, the environment settings that are in effect when the ALTER FUNCTION statement is issued must be the same as the environment settings that are in effect when the version of the function is first created using the CREATE FUNCTION or ALTER FUNCTION statement if...
You can make changes to tables, such as adding columns, changing the name, or dropping constraints. Depending on the change that you want to make, use either the AL or ALT line command.
在DB2中,可以使用ALTER TABLE语句来给表添加字段。以下是一个示例: ALTER TABLE 表名ADD COLUMN 新字段名 数据类型; 复制代码 例如,假设要给名为employee的表添加一个新字段salary,数据类型为DECIMAL(10,2),可以使用以下的SQL语句: ALTER TABLE employee ADD COLUMN salary DECIMAL(10,2); 复制代码 执行这条SQL...
[db2inst1@localhost ~]$ db2 "alter table people add column score interger not null with default 90" DB20000I The SQL command completed successfully. 例1.向表people中添加地址字段address默认设置为shanghai db2 "alter table people add column address varchar(30) not null with default 'ShangHai'"...
●db2logsForRfwd Parses the DB2TSCHG.HIS file. This utility allows a user to find out which log files are required for a table space rollforward operation. ●db2mtrk 查看内存 ●db2osconf Makes recommendations for kernel parameter values based on the size of a system. ...