SELECT a\nFROM t1\nCROSS JOIN t2
SELECT a\nFROM t1\nALL INNER JOIN t2 ON a = t2.a\nWHERE a = t2.a
SELECT a\nFROM t1\nALL INNER JOIN t2 ON b = t2.b\nWHERE b = t2.b
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        a AS `--t1.a`,\n        t2.a AS `--t2.a`\n    FROM t1\n    ALL INNER JOIN t2 ON `--t1.a` = `--t2.a`\n) AS `--.s`\nALL INNER JOIN t3 ON `--t1.a` = a\nWHERE (`--t1.a` = `--t2.a`) AND (`--t1.a` = a)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        b AS `--t1.b`,\n        a AS `--t1.a`,\n        t2.b AS `--t2.b`\n    FROM t1\n    ALL INNER JOIN t2 ON `--t1.b` = `--t2.b`\n) AS `--.s`\nALL INNER JOIN t3 ON `--t1.b` = b\nWHERE (`--t1.b` = `--t2.b`) AND (`--t1.b` = b)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.a`,\n        `--t2.a`,\n        a AS `--t3.a`\n    FROM \n    (\n        SELECT \n            a AS `--t1.a`,\n            t2.a AS `--t2.a`\n        FROM t1\n        ALL INNER JOIN t2 ON `--t1.a` = `--t2.a`\n    ) AS `--.s`\n    ALL INNER JOIN t3 ON `--t1.a` = `--t3.a`\n) AS `--.s`\nALL INNER JOIN t4 ON `--t1.a` = a\nWHERE (`--t1.a` = `--t2.a`) AND (`--t1.a` = `--t3.a`) AND (`--t1.a` = a)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.b`,\n        `--t1.a`,\n        `--t2.b`,\n        b AS `--t3.b`\n    FROM \n    (\n        SELECT \n            b AS `--t1.b`,\n            a AS `--t1.a`,\n            t2.b AS `--t2.b`\n        FROM t1\n        ALL INNER JOIN t2 ON `--t1.b` = `--t2.b`\n    ) AS `--.s`\n    ALL INNER JOIN t3 ON `--t1.b` = `--t3.b`\n) AS `--.s`\nALL INNER JOIN t4 ON `--t1.b` = b\nWHERE (`--t1.b` = `--t2.b`) AND (`--t1.b` = `--t3.b`) AND (`--t1.b` = b)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.a`,\n        `--t2.a`,\n        a AS `--t3.a`\n    FROM \n    (\n        SELECT \n            a AS `--t1.a`,\n            t2.a AS `--t2.a`\n        FROM t1\n        ALL INNER JOIN t2 ON `--t2.a` = `--t1.a`\n    ) AS `--.s`\n    ALL INNER JOIN t3 ON `--t2.a` = `--t3.a`\n) AS `--.s`\nALL INNER JOIN t4 ON `--t2.a` = a\nWHERE (`--t2.a` = `--t1.a`) AND (`--t2.a` = `--t3.a`) AND (`--t2.a` = a)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.a`,\n        `--t2.a`,\n        a AS `--t3.a`\n    FROM \n    (\n        SELECT \n            a AS `--t1.a`,\n            t2.a AS `--t2.a`\n        FROM t1\n        CROSS JOIN t2\n    ) AS `--.s`\n    ALL INNER JOIN t3 ON (`--t3.a` = `--t1.a`) AND (`--t3.a` = `--t2.a`)\n) AS `--.s`\nALL INNER JOIN t4 ON `--t3.a` = a\nWHERE (`--t3.a` = `--t1.a`) AND (`--t3.a` = `--t2.a`) AND (`--t3.a` = a)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.a`,\n        `--t2.a`,\n        a AS `--t3.a`\n    FROM \n    (\n        SELECT \n            a AS `--t1.a`,\n            t2.a AS `--t2.a`\n        FROM t1\n        CROSS JOIN t2\n    ) AS `--.s`\n    CROSS JOIN t3\n) AS `--.s`\nALL INNER JOIN t4 ON (a = `--t1.a`) AND (a = `--t2.a`) AND (a = `--t3.a`)\nWHERE (a = `--t1.a`) AND (a = `--t2.a`) AND (a = `--t3.a`)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        `--t1.a`,\n        `--t2.a`,\n        a AS `--t3.a`\n    FROM \n    (\n        SELECT \n            a AS `--t1.a`,\n            t2.a AS `--t2.a`\n        FROM t1\n        ALL INNER JOIN t2 ON `--t1.a` = `--t2.a`\n    ) AS `--.s`\n    ALL INNER JOIN t3 ON `--t2.a` = `--t3.a`\n) AS `--.s`\nALL INNER JOIN t4 ON `--t3.a` = a\nWHERE (`--t1.a` = `--t2.a`) AND (`--t2.a` = `--t3.a`) AND (`--t3.a` = a)
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT `--t1.a`\n    FROM \n    (\n        SELECT a AS `--t1.a`\n        FROM t1\n        CROSS JOIN t2\n    ) AS `--.s`\n    CROSS JOIN t3\n) AS `--.s`\nCROSS JOIN t4
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT `--t1.a`\n    FROM \n    (\n        SELECT a AS `--t1.a`\n        FROM t1\n        CROSS JOIN t2\n    ) AS `--.s`\n    CROSS JOIN t3\n) AS `--.s`\nCROSS JOIN t4
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT a AS `--t1.a`\n    FROM t1\n    CROSS JOIN t2\n) AS `--.s`\nCROSS JOIN t3
SELECT `--t1.a` AS `t1.a`\nFROM \n(\n    SELECT \n        a AS `--t1.a`,\n        t2.a AS `--t2.a`\n    FROM t1\n    ALL INNER JOIN t2 ON `--t1.a` = `--t2.a`\n) AS `--.s`\nCROSS JOIN t3
SELECT * FROM t1, t2
1	1	1	1
1	1	1	\N
2	2	1	1
2	2	1	\N
3	3	1	1
3	3	1	\N
4	4	1	1
4	4	1	\N
SELECT * FROM t1, t2 WHERE t1.a = t2.a
1	1	1	1
1	1	1	\N
SELECT t1.a, t2.a FROM t1, t2 WHERE t1.b = t2.b
1	1
SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.a = t2.a AND t1.a = t3.a
1	1	1
1	1	\N
1	\N	1
1	\N	\N
SELECT t1.a, t2.b, t3.b FROM t1, t2, t3 WHERE t1.b = t2.b AND t1.b = t3.b
1	1	1
SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t1.a = t3.a AND t1.a = t4.a
1	1	1	1
1	1	1	\N
1	1	\N	1
1	1	\N	\N
1	\N	1	1
1	\N	1	\N
1	\N	\N	1
1	\N	\N	\N
SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.b = t2.b AND t1.b = t3.b AND t1.b = t4.b
1	1	1	1
SELECT t1.a, t2.b, t3.b, t4.b FROM t1, t2, t3, t4 WHERE t1.a = t2.a AND t2.a = t3.a AND t3.a = t4.a
1	1	1	1
1	1	1	\N
1	1	\N	1
1	1	\N	\N
1	\N	1	1
1	\N	1	\N
1	\N	\N	1
1	\N	\N	\N