SQL inner join with filtering ?

• Yogesh Kumar
• 04-May-2022
• 0

Here is how I would do this with Snowflake:

 --create the tables and load data

--table1
CREATE TABLE TABLE1 (ID NUMBER, DATE DATE);

INSERT INTO TABLE1 VALUES (1,   '2022-01-01');
INSERT INTO TABLE1 VALUES (2  , '2022-02-01');
INSERT INTO TABLE1 VALUES (3  , '2022-02-05');

--table 2
CREATE TABLE TABLE2 (ID NUMBER, DATE DATE, AMOUNT NUMBER);
 
INSERT INTO TABLE2 VALUES(1,   '2021-08-01',    15);
INSERT INTO TABLE2 VALUES(1,   '2022-02-10',    15);
INSERT INTO TABLE2 VALUES(2,   '2022-02-15',    20);
INSERT INTO TABLE2 VALUES(2,   '2021-01-01',    15);
INSERT INTO TABLE2 VALUES(2,   '2022-02-20',    20);
INSERT INTO TABLE2 VALUES(1,   '2022-03-01',    15); 

Now obtain the data using a select

 SELECT TABLE1.ID, MAX(TABLE2.DATE), SUM(AMOUNT)
FROM TABLE1, TABLE2
WHERE TABLE1.ID = TABLE2.ID
  AND TABLE1.DATE < TABLE2.DATE 
  GROUP BY TABLE1.ID 

Results

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