How to obtain two values from a sub-query to be used in the where clause of sql

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I have to use two values in the where clause to be tested for equality of two values obtained from a subquery. Since I am working on an existing application, I want to keep it as a subquery. The following is my query.

SELECT 
    o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM 
    ORDER o WITH (NOLOCK) 
INNER JOIN  
    PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN 
    CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE 
    (o.EMAIL_ADDRESS, c.CUSTOMER_ID) IN (SELECT EMAIL_ADDRESS, CUSTOMER_ID 
                                         FROM CUSTOMER_MASTER 
                                         WHERE insert_date > '01/02/2019')

The problem I am facing is that the first value within the where clause, o.EMAIL_ADDRESS, throws the following error:

An expression of non-boolean type specified in a context where a condition is expected

When I use a single value within the where clause it works fine.

One method is with EXISTS and a correlated subquery.

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER_HEADER oh  WITH (NOLOCK) 
INNER JOIN  PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE EXISTS(
    SELECT 1
    FROM CUSTOMER_MASTER AS cm
    WHERE cm.insert_date > '01/02/2019'
    AND o.EMAIL_ADDRESS = cm.EMAIL_ADDRESS
    AND c.CUSTOMER_ID = cm.c.CUSTOMER_ID
    );

How to obtain two values from a sub-query to be used in the where , One method is with EXISTS and a correlated subquery. SELECT o. EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID FROM ORDER_HEADER� I have to use two values in the where clause to be tested for equality of two values obtained from a subquery. Since I am working on an existing application, I want to keep it as a subquery. The following is my query.

in allows single column list only. So create single column.

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER o  WITH (NOLOCK) 
INNER JOIN  PARTY p WITH (NOLOCK) ON o.ORDER_ID = p.PARTY_ID 
INNER JOIN CUSTOMER c WITH (NOLOCK) ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE o.EMAIL_ADDRESS + cast(c.CUSTOMER_ID as varchar) 
IN (select EMAIL_ADDRESS + cast(CUSTOMER_ID as varchar)
from CUSTOMER_MASTER where insert_date > '01/02/2019')

SQL : Multiple Row and Column Subqueries, Multiple row subquery returns one or more rows to the outer SQL statement. IN operator is used to checking a value within a set of values. To get 'ord_num', ' ord_amount', 'ord_date', 'cust_code' and 'agent_code' from the table 'orders' with following conditions : Here is the complete SQL statement: The EXISTS condition is used in combination with a subquery. It returns TRUE whenever the subquery returns one or more values. In its simplest form the syntax for the EXISTS condition is. WHERE EXISTS (sub query) Suppose we need to return all sales orders written by salespeople with sales year to date greater than three million dollars.

Use EXISTS. I would also advise fixing the date format:

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, p.PARTY_ID
FROM ORDER o JOIN
     PARTY p 
     ON o.ORDER_ID = p.PARTY_ID JOIN
     CUSTOMER c 
     ON p.PARTY_ID = c.CUSTOMER_ID 
WHERE EXISTS (SELECT 1
              FROM CUSTOMER_MASTER cm
              WHERE cm.EMAIL_ADDRESS = o.EMAIL_ADDRESS AND
                    cm.CUSTOMER_ID = c.CUSTOMER_ID AND
                    cm.insert_date > '2019-02-01'
             );

Your date constants should be in the YYYYMMDD format.

Based on your logic, though, I don't think you need all the JOINs:

SELECT o.EMAIL_ADDRESS, c.FIRST_NAME, o.ORDER_ID
FROM ORDER o JOIN
     CUSTOMER c 
     ON o.ORDER_ID = c.CUSTOMER_ID 
WHERE EXISTS (SELECT 1
              FROM CUSTOMER_MASTER cm
              WHERE cm.EMAIL_ADDRESS = o.EMAIL_ADDRESS AND
                    cm.CUSTOMER_ID = c.CUSTOMER_ID AND
                    cm.insert_date > '2019-02-01'
             );

The table PARTY doesn't seem necessary, because the orders can align directly to the customers.

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