db2上的错误代码-193

Question

我想改变我的数据库上的一些表，这是一个sql和错误消息。我搜索过db2文档和谷歌，但我没有找到它。

Answer 1

当您看到SQLCODE错误消息（如-193）时，它与错误消息SQL0193相同。获得帮助的最简单方法是使用db2命令窗口并键入

db2 ? SQL193

该消息表明如果没有默认值，则无法添加非空列。添加列时包含默认值，然后如果不需要默认值，则使用第二个alter table语句删除默认值。

SQL0193N
In an ALTER TABLE statement, the column column-name has been specified as NOT NULL and    either the DEFAULT clause was not specified or was specified as DEFAULT NULL.

Explanation
When new columns are added to a table that already exists, a value must be assigned to that new column for all existing rows. By default, the null value is assigned. However, since the column has been defined as NOT NULL, a default value other than null must be defined.

User response
Either remove the NOT NULL restriction on the column or provide a default value other than null for the column.

sqlcode: -193

sqlstate: 42601

Parent topic: SQL Messages

消息主题

Answer 2

标记为答案的消息是正确的！

以下是一些查找特定语句的示例（就像我以前一样）：

alter table table_example add SAMPLE_ID int not null default 0;
alter table table_example alter column SAMPLE_ID drop default;