Oracle SQL: Get all users in one table but not another and join to a third table

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I am wondering how to use oracle sql to get all the rows that are in one table but not another. The issue I am having is that the two tables don't have a field in common so I need to join to a third master table.

This is what I've tried which doesn't produce any errors but also produces 0 records which isn't possible but clearly I've done something wrong.

 SELECT a.USER_ID, c.AD_ID, c.CREATED_DATE_ FROM $A$ a, $C$ c, $B$ b 
 WHERE (b.USER_ID IS NULL AND a.CUSTOMER_ID = c.CUSTOMER_ID) 

I have three tables:

Table A has fields CUSTOMER_ID & USER_ID

Table B has field USER_ID

Table C has field CUSTOMER_ID

I need all the users that are in table C but not table B. They are all in Table A because that is the master list of users.

Any insight would be greatly appreciated.

SELECT
  *
FROM
  table_a
WHERE
  NOT EXISTS (SELECT * FROM table_b WHERE table_b.user_id     = table_a.user_id    )
  AND EXISTS (SELECT * FROM table_c WHERE table_c.customer_id = table_a.customer_id)

Tutorial: Joining Tables: Databases for Developers, A cross join returns every row from the first table matched to every row in the And not that you forgot your join clause! in a column from one table equal the values in a column from the other. Only the ids 2 & 3 are in both tables. You also get the rows from bricks which have the same id as these: Oracle SQL List Tables. If you’ve forgotten the name of a specific table, or forgotten how to spell a table (was it plural or singular? One word or two with an underscore?), then you can use these queries to show all tables in Oracle SQL.

My solution:

select * from TableC tc
join TableA ta on tc.CUSTOMER_ID=ta.CUSTOMER_ID
left join TableB tb on tb.USER_ID=ta.USER_ID
where ta.USER_ID is null

The UNION [ALL], INTERSECT, MINUS Operators, This statement shows that you must match datatype (using the TO_CHAR function) when columns do not exist in one or the other table: SELECT location_id,  ALL_USERS lists all users of the database visible to the current user. This view does not describe the users (see the related views). DBA_USERS describes all users of the database, and contains more columns than ALL_USERS. USER_USERS describes the current user, and contains more columns than ALL_USERS. Name of the user. ID number of the user.

I think you want:

select a.USER_ID, c.AD_ID, c.CREATED_DATE_
from a join
     c
     on a.customer_id = c.customer_id
where not exists (select 1 from b where b.user_id = a.user_id);

The Global Paleomagnetic Database: Design, Installation and Use , Design, Installation and Use with ORACLE Jo Lock, M.W. McElhinny 3. The subquery query may retrieve values from a different table to the outer query. Consult the SQL*Plus User's Guide for more information and examples. If a row in one of the tables does not satisfy the join condition, then that row will not appear in  this should select all columns from table 1 and only the listed columns from table 2 joined by id. Using alias for referencing the tables to get the columns from different tables after joining them. Please don't answer unless you are adding something new.

Ask TOM "join example, new vs old syntax", a cross product is a cartesian join -- but how you get from a subquery (and a "​column 3 left outer join emp b the left outer join syntax basically says "all rows in DEPT will be output". ON is a join clause, a new thing in Oracle SQL with 9i. rows from one table for which no rows from the other satisfy the join condition. Now, with these 2 tables in my hands I need to get only the users from the table @6To3MonthsUsers that are not in @Last3MonthsUsers table. There are 2 simple ways to achieve that: Using Left Join: select distinct a.UserID from @6To3MonthsUsers a left join @Last3MonthsUsers b on a.UserID = b.UserID where b.UserID is null Not in:

Ask TOM "IN (vs) EXISTS and NOT IN (vs) NOT EXISTS", SQL> select count(*) from emp where empno not in ( select mgr from emp ); i want to filter only those records from first table where all sub_item_cd exists in second table return the set of primary keys from jobhist for joining to the other table. not so good the cbo does OK though with the user written one:</b> select  Someone could theoretically deny you access to that type, but it's probably not something you need to worry about. Works perfectly and very clean. Really neat way to get result that was not part of the table values. I used to do it using a UNION for each value and it was long.

PC Mag, dtluery: SDL and DRE for dBASE, 1-2-3 Files select nane. per-i0tl_en¢l. While a few PC DBMSs, such as Paradox and Oracle, have supported one or the other for years, others IV database files as well, though dQuery claims no dBASE IV compatibility. In SQL, the data resulting from a query goes into a table or a view​. In Oracle, it is safe to use any method of the three described above to select values from a table that are missing in another table. However, if the values are not guaranteed to be NOT NULL, LEFT JOIN / IS NULL or NOT EXISTS should be used rather than NOT IN, since the latter will produce different results depending on whether or not there are

Comments
  • There are no users in table c, you specifically say it only lists customers?
  • Table C has customers/users but only the CUSTOMER_ID field is used to identify them.
  • @TM3 . . . And what happens when you have multiple rows in C for a given customer in C? Sample data and desired results are really helpful.
  • Does assume 1:1 relationship between A and C
  • @MatBailie . . . No, it answers the OP's question. If the OP wants columns from C, then I assume s/he wants all matching rows.
  • I need all the users that are in table C but not table B. They are all in Table A because that is the master list of users. If A is the master list of user then C could have a many:1 relationship with A. It certainly does adapt the OP's attempt to solve the OP's requirement, but even that does not preclude the OP having made the assumption.
  • @Gordon Linoff ... This seems to work for me, You're correct C does have a 1:many relationship with A. Is your code pulling only one row of each user or all?