SELECT a
FROM t1_00849
CROSS JOIN t2_00849
SELECT a
FROM t1_00849
ALL INNER JOIN t2_00849 ON a = t2_00849.a
WHERE a = t2_00849.a
SELECT a
FROM t1_00849
ALL INNER JOIN t2_00849 ON b = t2_00849.b
WHERE b = t2_00849.b
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        a AS `--t1_00849.a`,
        b,
        t2_00849.a AS `--t2_00849.a`,
        t2_00849.b
    FROM t1_00849
    ALL INNER JOIN t2_00849 ON `--t1_00849.a` = `--t2_00849.a`
) AS `--.s`
ALL INNER JOIN t3_00849 ON `--t1_00849.a` = a
WHERE (`--t1_00849.a` = `--t2_00849.a`) AND (`--t1_00849.a` = a)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        a AS `--t1_00849.a`,
        b AS `--t1_00849.b`,
        t2_00849.a,
        t2_00849.b AS `--t2_00849.b`
    FROM t1_00849
    ALL INNER JOIN t2_00849 ON `--t1_00849.b` = `--t2_00849.b`
) AS `--.s`
ALL INNER JOIN t3_00849 ON `--t1_00849.b` = b
WHERE (`--t1_00849.b` = `--t2_00849.b`) AND (`--t1_00849.b` = b)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `--t2_00849.a`,
        `t2_00849.b`,
        a AS `--t3_00849.a`,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a AS `--t2_00849.a`,
            t2_00849.b
        FROM t1_00849
        ALL INNER JOIN t2_00849 ON `--t1_00849.a` = `--t2_00849.a`
    ) AS `--.s`
    ALL INNER JOIN t3_00849 ON `--t1_00849.a` = `--t3_00849.a`
) AS `--.s`
ALL INNER JOIN t4_00849 ON `--t1_00849.a` = a
WHERE (`--t1_00849.a` = `--t2_00849.a`) AND (`--t1_00849.a` = `--t3_00849.a`) AND (`--t1_00849.a` = a)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        `--t1_00849.b`,
        `t2_00849.a`,
        `--t2_00849.b`,
        a,
        b AS `--t3_00849.b`
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b AS `--t1_00849.b`,
            t2_00849.a,
            t2_00849.b AS `--t2_00849.b`
        FROM t1_00849
        ALL INNER JOIN t2_00849 ON `--t1_00849.b` = `--t2_00849.b`
    ) AS `--.s`
    ALL INNER JOIN t3_00849 ON `--t1_00849.b` = `--t3_00849.b`
) AS `--.s`
ALL INNER JOIN t4_00849 ON `--t1_00849.b` = b
WHERE (`--t1_00849.b` = `--t2_00849.b`) AND (`--t1_00849.b` = `--t3_00849.b`) AND (`--t1_00849.b` = b)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `--t2_00849.a`,
        `t2_00849.b`,
        a AS `--t3_00849.a`,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a AS `--t2_00849.a`,
            t2_00849.b
        FROM t1_00849
        ALL INNER JOIN t2_00849 ON `--t2_00849.a` = `--t1_00849.a`
    ) AS `--.s`
    ALL INNER JOIN t3_00849 ON `--t2_00849.a` = `--t3_00849.a`
) AS `--.s`
ALL INNER JOIN t4_00849 ON `--t2_00849.a` = a
WHERE (`--t2_00849.a` = `--t1_00849.a`) AND (`--t2_00849.a` = `--t3_00849.a`) AND (`--t2_00849.a` = a)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `--t2_00849.a`,
        `t2_00849.b`,
        a AS `--t3_00849.a`,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a AS `--t2_00849.a`,
            t2_00849.b
        FROM t1_00849
        CROSS JOIN t2_00849
    ) AS `--.s`
    ALL INNER JOIN t3_00849 ON (`--t3_00849.a` = `--t1_00849.a`) AND (`--t3_00849.a` = `--t2_00849.a`)
) AS `--.s`
ALL INNER JOIN t4_00849 ON `--t3_00849.a` = a
WHERE (`--t3_00849.a` = `--t1_00849.a`) AND (`--t3_00849.a` = `--t2_00849.a`) AND (`--t3_00849.a` = a)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `--t2_00849.a`,
        `t2_00849.b`,
        a AS `--t3_00849.a`,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a AS `--t2_00849.a`,
            t2_00849.b
        FROM t1_00849
        CROSS JOIN t2_00849
    ) AS `--.s`
    CROSS JOIN t3_00849
) AS `--.s`
ALL INNER JOIN t4_00849 ON (a = `--t1_00849.a`) AND (a = `--t2_00849.a`) AND (a = `--t3_00849.a`)
WHERE (a = `--t1_00849.a`) AND (a = `--t2_00849.a`) AND (a = `--t3_00849.a`)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `--t2_00849.a`,
        `t2_00849.b`,
        a AS `--t3_00849.a`,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a AS `--t2_00849.a`,
            t2_00849.b
        FROM t1_00849
        ALL INNER JOIN t2_00849 ON `--t1_00849.a` = `--t2_00849.a`
    ) AS `--.s`
    ALL INNER JOIN t3_00849 ON `--t2_00849.a` = `--t3_00849.a`
) AS `--.s`
ALL INNER JOIN t4_00849 ON `--t3_00849.a` = a
WHERE (`--t1_00849.a` = `--t2_00849.a`) AND (`--t2_00849.a` = `--t3_00849.a`) AND (`--t3_00849.a` = a)
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `t2_00849.a`,
        `t2_00849.b`,
        a,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a,
            t2_00849.b
        FROM t1_00849
        CROSS JOIN t2_00849
    ) AS `--.s`
    CROSS JOIN t3_00849
) AS `--.s`
CROSS JOIN t4_00849
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        `--t1_00849.a`,
        b,
        `t2_00849.a`,
        `t2_00849.b`,
        a,
        t3_00849.b
    FROM 
    (
        SELECT
            a AS `--t1_00849.a`,
            b,
            t2_00849.a,
            t2_00849.b
        FROM t1_00849
        CROSS JOIN t2_00849
    ) AS `--.s`
    CROSS JOIN t3_00849
) AS `--.s`
CROSS JOIN t4_00849
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        a AS `--t1_00849.a`,
        b,
        t2_00849.a,
        t2_00849.b
    FROM t1_00849
    CROSS JOIN t2_00849
) AS `--.s`
CROSS JOIN t3_00849
SELECT `--t1_00849.a` AS `t1_00849.a`
FROM 
(
    SELECT
        a AS `--t1_00849.a`,
        b,
        t2_00849.a AS `--t2_00849.a`,
        t2_00849.b
    FROM t1_00849
    ALL INNER JOIN t2_00849 ON `--t1_00849.a` = `--t2_00849.a`
) AS `--.s`
CROSS JOIN t3_00849
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