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select version();
version()
8.0.30
CREATE TABLE table1 (columnB INTEGER);

INSERT INTO table1 VALUES
(1256),
(12345),
(1256),
(5678),
(1256),
(78905)
Records: 6  Duplicates: 0  Warnings: 0
CREATE TABLE table2 (columnA INTEGER);

INSERT INTO table2 VALUES
(12345),
(56789),
(34890),
(78905)
Records: 4  Duplicates: 0  Warnings: 0
SELECT table1.columnB
FROM table1
INNER JOIN table2 ON table2.columnA = table1.columnB
columnB
12345
78905