Operand Type Clash: Int Is Incompatible with Date + the Insert Statement Conflicted with the Foreign Key Constraint

Operand type clash: int is incompatible with date + The INSERT statement conflicted with the FOREIGN KEY constraint

This expression 12-4-2005 is a calculated int and the value is -1997. You should do like this instead '2005-04-12' with the ' before and after.

Operand type clash: int is incompatible with date when using CASE WHEN and return Column Value

I have my answer

because AVL is int we must

 CASE
    WHEN [AVL] = 1 THEN '1' --datefromparts(1900, 1, 1)
    WHEN [DATE_1] IS NOT NULL THEN convert(nvarchar(10),[DATE_1])  
    WHEN [DATE_2] IS NOT NULL THEN cast(DATEADD(DD,+2,[DATE]_2) as varchar)

because I want the output is string or nvarchar

Operand type clash: date is incompatible with int with CASE WHEN

0 is an int and you are trying to compare it with a date.

Either you could try to pick a date ('1900-01-01') or work with null values to make a valid comparison.

Operand type clash: int is incompatible with date when I am trying to update my database

The DATE Value in SQL must be placed in single quotes '

I am running this query for updating the datetime column in my table:

DateTime today = DateTime.Today;
string[] queries = new string[] { "UPDATE *** SET ExpirationDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET WrittenDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET SystemDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET SystemDate = '" + today.ToString("yyyy/MM/dd") + "'",
"UPDATE *** SET EventDate = '" + today.ToString("yyyy/MM/dd") + "'"};

I am not sure about the "yyyy/MM/dd", I guess you should place it "yyyyMMdd".

My INSERT statement conflicted with the FOREIGN KEY constraint

In your table [dbo].Hastalar, it has a foreign key reference to another table. The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table.

If you have SQL Server Management Studio, open it up and sp_help '[dbo].Hastalar'. See which column that FK is on, and which column of which table it references. You're inserting some bad data.

INSERT statement conflicted with the FOREIGN KEY constraint - SQL Server

In your table dbo.Sup_Item_Cat, it has a foreign key reference to another table. The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table.

If you have SQL Server Management Studio, open it up and sp_help 'dbo.Sup_Item_Cat'. See which column that FK is on, and which column of which table it references. You're inserting some bad data.

Let me know if you need anything explained better!

SQL Operand type clash: int is incompatible with date SQL Server cannot change date type format

replace your alter code with the following

alter table emp_demo3
add date_diff1 int
go
update emp_demo3 set date_diff1 = datediff(day,joining_date, last_time)

INSERT statement conflicted with the FOREIGN KEY constraint - SQL

Here is your insert statement:

INSERT INTO Title (ISBN, Title, CategoryCode, PublisherCode, SuggestedPrice, NumberInStock)
VALUES ('1021031040', 'PL SQL', 1, 200, 75.50, 10);

The error message seems to be saying that there is no record in the publisher table whose primary key is 200. That is, your insert is referring to a publisher record which does not exist. The remedy would be to either not do this insert, or to add a record to the publisher table with an id of 200.

Operand type clash: int is incompatible with date

Some of your fields (like OrderlineCreateDate) are not of the date but int type. But CONVERT(VARCHAR(8), field, 112) expects field to be a date, so there is a data type conflict.

If those fields are really intended to be of the type int one could wonder why you would convert those to varchar and then back to int again.

And then you insert them into a table that expects them to a be a date.

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