SQL连接1个表和2个表值函数返回的表

Question

I have a database with a table, which I will call Table1. The database also has 2 table-valued functions. The first function returns a table which I will call Table2 and the second function returns a table which I will call Tabel3. There is also a 4th table, which I will call Table4, which I want to insert records into.

Table1 has the following fields:

Fileno
Description
GeneralCode

The first function takes in 2 parameters (Table1.Fileno, Table1.Description) and returns Table2, which has the following fields:

FileNum
Desc1
Desc2
Desc3

The second function takes in 2 parameters (Table1.Fileno, Table1.GeneralCode) and returns Table3, which has the following fields:

FileNum
Code1
Code2

The forth table, Table4, has the following fields:

CaseNum
Desc1
Desc2
Desc3
Code1
Code2    

I wrote the following query which works:

DELETE FROM Table4
INSERT INTO Table4(CaseNum, Desc1, Desc2, Desc3)
SELECT Fileno, Desc1, Desc2, Desc3
FROM Table1 
CROSS APPLY function1(FileNo, Description)

This query runs, calls the function (which returns a table), and inserts data into Table4.

Now, I need to modify the query to call a second function, which will return another table, and insert that data into Table4. I have the following code:

DELETE FROM Table4
INSERT INTO Table4(CaseNum, Desc1, Desc2, Desc3, Code1, Code2)
SELECT m.Fileno, d.Desc1, d.Desc2, d.Desc3, c.Code1, c.Code2
FROM Table1 m
INNER JOIN function1(m.Fileno, m.Description) d ON d.FileNum = m.Fileno
LEFT OUTER JOIN function2(m.Fileno, m.GeneralCode) c ON c.FileNum = m.Fileno;

But this code does not work. Intellisense highlights the fields that I am passing to the functions so obviously I can't reference these fields in this manner but I'm not sure how to resolve that.

Any help is greatly appreciated. Thanks!

Answer 1

Your query should probably look something like the following.

You can apply multiple table expressions or TVFs, you're showing an outer-join in your sample query so use outer apply where you might (presumably) not get a row returned, and then handle the NULLs, if necessary.

select m.Fileno, 
    f1.Desc1, f1.Desc2, f1.Desc3, 
    IsNull(f2.Code1,''), IsNull(f2.Code2,'')
from Table1 m
cross apply function1(m.FileNo, m.Description)f1
outer apply function2(m.FileNo, m.GeneralCode)f2;