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50 lines
991 B
SQL
50 lines
991 B
SQL
DROP TABLE IF EXISTS t1;
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DROP TABLE IF EXISTS t2;
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DROP TABLE IF EXISTS t3;
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CREATE TABLE t1 (`1a` Nullable(Int64), `2b` Nullable(String)) engine = Memory;
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CREATE TABLE t2 (`3c` Nullable(Int64), `4d` Nullable(String)) engine = Memory;
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CREATE TABLE t3 (`5e` Nullable(Int64), `6f` Nullable(String)) engine = Memory;
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SELECT
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`1a`,
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`2b`
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FROM t1 AS tt1
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INNER JOIN
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(
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SELECT `3c`
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FROM t2
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) AS tt2 ON tt1.`1a` = tt2.`3c`
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INNER JOIN
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(
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SELECT `6f`
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FROM t3
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) AS tt3 ON tt1.`2b` = tt3.`6f`;
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DROP TABLE t1;
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DROP TABLE t2;
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DROP TABLE t3;
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CREATE TABLE t1 (`a` Nullable(Int64), `b` Nullable(String)) engine = Memory;
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CREATE TABLE t2 (`c` Nullable(Int64), `d` Nullable(String)) engine = Memory;
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CREATE TABLE t3 (`e` Nullable(Int64), `f` Nullable(String)) engine = Memory;
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SELECT
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a,
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b
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FROM t1 AS tt1
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INNER JOIN
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(
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SELECT c
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FROM t2
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) AS tt2 ON tt1.a = tt2.c
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INNER JOIN
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(
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SELECT f
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FROM t3
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) AS tt3 ON tt1.b = tt3.f;
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DROP TABLE t1;
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DROP TABLE t2;
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DROP TABLE t3;
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