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一般我们用SELECT .... INTO语句生成的表字段都是允许为NULL。而如果我们需要改成NOT NULL呢
select ‘ALTER TABLE dbo.XXXXXXX ALTER COLUMN ‘ + QUOTENAME(c.name) + ‘ ‘ + t.name + case when t.name in (‘nvarchar‘,‘nchar‘) then ‘(‘+ cast(c.max_length/2 as nvarchar) +‘)‘ when t.name in (‘varchar‘,‘binary‘, ‘char‘, ‘varbinary‘) then ‘(‘+ cast(c.max_length as nvarchar) +‘)‘ else ‘‘ end + ‘ NOT NULL‘ from sys.columns c join sys.types t on c.system_type_id = t.system_type_id where object_id = object_id (‘dbo.XXXXXXX‘) and t.name <> ‘sysname‘ order by column_id
有时需要准备数据库设计文档，里面的物理设计这块需要填写像这样的表
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Table: dbo.DimMonth |
||||
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Column Name |
Data Type |
Key |
Nullable |
Comment |
|
Monthkey |
bigint |
PK |
No |
|
|
CalendarMonth |
bigint |
|
No |
|
|
CalendarMonthName |
nvarchar(30) |
|
No |
|
|
CalendarQuarter |
bigint |
|
No |
|
|
CalendarQuarterName |
nvarchar(30) |
|
No |
|
|
CalendarYear |
bigint |
|
No |
|
|
CalendarYearName |
nvarchar(30) |
|
No |
|
|
FiscalMonthName |
nvarchar(30) |
|
No |
|
|
FiscalMonthOfYear |
bigint |
|
No |
|
|
FiscalQuarter |
bigint |
|
No |
|
|
FiscalQuarterName |
nvarchar(30) |
|
No |
|
|
FiscalYear |
bigint |
|
No |
|
|
FiscalYearName |
nvarchar(30) |
|
No |
|
如果比本身已经建立好在数据库中，我们可以通过一条脚本生成
select c.name, t.name + case when t.name in (‘nvarchar‘,‘nchar‘) then ‘(‘+ cast(c.max_length/2 as nvarchar) +‘)‘ when t.name in (‘varchar‘,‘binary‘, ‘char‘, ‘varbinary‘) then ‘(‘+ cast(c.max_length as nvarchar) +‘)‘ else ‘‘ end, case when c.is_nullable = 1 then ‘Yes‘ ELSE ‘No‘ end from sys.columns c join sys.types t on c.system_type_id = t.system_type_id where object_id = object_id (‘dbo.XXXXXXX‘) and t.name <> ‘sysname‘ order by column_id
SQL Server ->> 生成代码把表字段从NULL改为NOT NULL
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原文地址：http://www.cnblogs.com/jenrrychen/p/4894812.html
