Need Combined SQL Query to Update 2 Tables - sql

Question

I am having 2 tables. Table1 and Table2. I need to update these 2 tables based on some conditions.
The SQL select query from Table1 will return multiple records, let's
name it as SQLQuery1
From SQLQuery1 results returned I need to loop through each record and
execute another SQL query from Table2 which will return only 1
record, let's name it as SQLQuery2
Update Table1 and Table2 with the results returned from SQLQuery2.
Is there is a single query to combine the above operations?
If you need more information please let me know
UPDATE:
Following are the Sample Queries used,
SELECT E.Id,E.Name
from Employee E
where E.transdate > '2019-01-201 00:00:01' -- Multiple Results(SQLQuery1)
SELECT top 1 ED.Id,ED.balance
FROM EmployeeDetails ED
where ED.Name= #Name -- Single Results((SQLQuery2)
UPDATE Employee set IsProcessed=true
where Id=#Id
UPDATE EmployeeDetails set IsProcessed=true
where Id=#Id

Answer 1

I would use an UPDATE with an INNER JOIN. I have no idea if it's best practice at this point in time or whether there is a better way to do this but it works for the example I have created in dbfiddle.
Something like this:
UPDATE E
SET IsProcessed = 1
FROM Employee E
INNER JOIN EmployeeDetails ED ON E.Id = ED.Id
WHERE E.transdate >= '2019-01-20 00:00:01' AND ED.name = 'Martin'
UPDATE ED
SET IsProcessed = 1
FROM EmployeeDetails ED
INNER JOIN Employee E ON E.Id = ED.Id
WHERE E.transdate >= '2019-01-20 00:00:01' AND ED.name = 'Martin'
I used >= because I just set all 3 created records to the datetime you have and forgot that looking for a datetime greater than that would provide me with nothing. I also used a hard-coded name Martin instead of using a variable.
Here is my link to the dbfiddle I created in which I created Employee and EmployeeDetails, filled them with test data and then proceeded to identify the correct records using the date, time and name joined by their ID values:
https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=4492b27a9790f34b0bff0996e7fb6d36

Answer 2

Use INNER JOIN :
update e
set e.IsProcessed = 1 -- assuming BIT type
from employee e inner join
EmployeeDetails ed
on ed.name = e.name and ed.id = e.id
where e.transdate > '2019-01-201 00:00:01';
update ed
set ed.IsProcessed = 1 -- assuming BIT type
from EmployeeDetails ed inner join
Employee e
on ed.name = e.name and ed.id = e.id and
where e.transdate > '2019-01-201 00:00:01';

Answer 3

I wouldn't do it like this.
You can use outer apply to get rid of the cursor:
SELECT *
FROM T_Query1
OUTER APPLY
(
SELECT TOP 1 * FROM T_Query2
WHERE T_Query2.query1_id = T_Query1.id
) AS tQuery2
Then you can do an update like this:
UPDATE A
SET some_value = tQuery2.some_new_value
FROM T_Query1 AS A
OUTER APPLY
(
SELECT TOP 1 * FROM T_Query2
WHERE T_Query2.query1_id = A.id
) AS tQuery2
Besides that, you cannot update 2 tables with one update statement, AFAIK.
Your best bet would be
;WITH CTE AS
(
SELECT T_Query1.field1, T_Query2.field2, T_Query2.newField1
FROM T_Query1
OUTER APPLY
(
SELECT TOP 1 * FROM T_Query2
WHERE T_Query2.query1_id = T_Query1.id
) AS tQuery2
)
-- SELECT * FROM CTE
UPDATE CTE SET field1 = newField1, field2 = newField1
but I don't think CTE updating can handle outer-apply.