Question

I am using VS2005 and SQL Server 2005.

I am trying to execute multiple sql statements on two sql tables, meaning which I need to do more than a single check on the two tables.

The two tables are:

Table1: UserID, Username.

Table2: UserID, Status.

The following are the checks that I need to perform, but I do not know what is the exact SQL query I need.

1. Users that exist in Table1 should exist in Table2

2. Users that exist is Table1 should not have STATUS=DELETE in Table2

3. Users that do not have STATUS=DELETE in Table2 should exist in Table1

May I know how do I form this checks in to SQL queries and execute them in my VS Sqldatasource?

After which store the results in a variable and display them in GridView table.

Thank You very much for the help.

Answer 1

So you have 3 cases you want to catch:

1. User exists in table1 but not in table2
2. User is marked as DELETE in table2 but still exists in table1
3. User is NOT marked as DELETE in table2 but doesn’t exist in table1

These three scenarios are covered in the WHERE clause below in that order.

SELECT *
FROM table1 t1
FULL OUTER JOIN table2 t2 ON t1.userid = t2.userid
WHERE (t2.userid IS NULL AND t1.userid IS NOT NULL)
OR (t2.status = 'DELETE' AND t1.userid IS NOT NULL)
OR (t2.userid IS NOT NULL AND t2.status <> 'DELETE' AND t1.userid IS NULL)

---

Edit: In response to the OP’s comment, here is a modified version that will insert data into table3 based on case #1. Assume that table3 is a table that has two columns, userID and problem.

INSERT INTO table3
SELECT userID, 'No Matching Table2 Record'
FROM table1 t1
FULL OUTER JOIN table2 t2 ON t1.userid = t2.userid
WHERE (t2.userid IS NULL AND t1.userid IS NOT NULL)