SQL Server：从mysql迁移时，日期与int不兼容。 怎么解决？

Question

I have similar databases, they come from the same CMS but they use different databases: some are originally SQL Server, and another one is MySQL.

I had to migrate the MySQL database to SQL server since I have some scripts ready for SQL Server which a. a don't want to convert, b. are more complicated to convert since some functions I use are not implemented in MySQL.

This query on the database which were originally SQL Server runs without problems:

SELECT Birth_Date+1 FROM TABLENAME

while, when I run it on the same table in the database I migrated from SQL, I get this error:

Operand type clash: date is incompatible with int

Any idea why I get this error and how I can solve it?

I migrated my database with SSMA, SQL Server Migration Assistent, if this can help.

Thank you.

Answer 1

The message is rather clear, you can't use the + operator with a date and an int.

You should use the DATEADD function (in Sql Server)

And DATE_ADD in mysql.

DATE_ADD(Birth_Date, interval 1 DAY) for example.

which is

DATEADD(day, 1, Birth_Date) in Sql Server

Answer 2

The error seems pretty clear. You can't add an integer to a date , although you can add an integer to a datetime . Presumably, the data type of Birth_Date is date in one database and datetime (or something similar) in the other.

Here are two solutions:

SELECT cast(Birth_Date as datetime)+1 FROM TABLENAME;

SELECT dateadd(day, 1, Birth_Date) FROM TABLENAME;