How do I check if a SQL Server datetime column is empty?

Question

如何检查SQL Server datetime列是否为空？

Answer 1

Test it with IS NULL .

If using .NET, test against DBNULL .

Answer 2

... WHERE [ColumnName] IS NULL

Or do you mean something else by "empty" that isn't NULL ? Does your column allow NULL values? Are you instead looking for some kind of default value?

Answer 3

要使用空的日期时间列获取所有行，您可以执行以下操作：

SELECT * FROM yourtable WHERE yourdatecolumn IS NULL

Answer 4

This worked for me in C# , Where

con is my Sql Connection

SqlCommand cmd = new SqlCommand("Select * From Transactions WHERE TransactionID = '"+tid+ "'AND InDate IS NULL ", con);

Answer 5

net使用IsDBNull或在transact sql中使用为null。

Answer 6

作为使用NULL的替代方法，您可以尝试：

SELECT * FROM table_name WHERE column_name = '0000-00-00'