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18 lines
503 B
SQL
18 lines
503 B
SQL
DROP TABLE IF EXISTS table1;
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DROP TABLE IF EXISTS table2;
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CREATE TABLE table1 ( id String ) ENGINE = Log;
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CREATE TABLE table2 ( parent_id String ) ENGINE = Log;
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insert into table1 values ('1');
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SELECT table2.parent_id = '', isNull(table2.parent_id)
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FROM table1 ANY LEFT JOIN table2 ON table1.id = table2.parent_id;
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SET join_use_nulls = 1;
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SELECT table2.parent_id = '', isNull(table2.parent_id)
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FROM table1 ANY LEFT JOIN table2 ON table1.id = table2.parent_id;
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DROP TABLE table1;
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DROP TABLE table2;
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