libsql-wal 0.1.0-alpha.1

wal implementation for libsql
Documentation
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  CREATE TABLE t1(a,b,c);
  CREATE TABLE t2(x,y);
  CREATE INDEX t2x ON t2(x);
  SELECT avg(DISTINCT b) FROM (SELECT * FROM t2 LEFT RIGHT JOIN t1 ON c);


  CREATE TABLE t1(a INTEGER PRIMARY KEY AUTOINCREMENT,b,c,d,e,f,g,h,j,k,l,m,n,o,p,q,r,s);
  CREATE INDEX t1x1 ON t1(g+h,j,k);
  CREATE INDEX t1x2 ON t1(b);
  INSERT INTO t1 DEFAULT VALUES;


  CREATE TABLE t1(a int, b int, c int);
  INSERT INTO t1 VALUES(1,2,3),(4,5,6);
  CREATE TABLE t2(d int, e int);
  INSERT INTO t2 VALUES(3,333),(4,444);
  CREATE TABLE t3(f int, g int);
  PRAGMA automatic_index=off;


  CREATE TABLE t1(id INTEGER PRIMARY KEY, a INT);
  CREATE TABLE t2(id INTEGER PRIMARY KEY, b INT);
  CREATE TABLE t3(id INTEGER PRIMARY KEY, c INT);
  CREATE TABLE t4(id INTEGER PRIMARY KEY, d INT);
  CREATE TABLE t5(id INTEGER PRIMARY KEY, e INT);
  CREATE TABLE t6(id INTEGER PRIMARY KEY, f INT);
  CREATE TABLE t7(id INTEGER PRIMARY KEY, g INT);
  CREATE TABLE t8(id INTEGER PRIMARY KEY, h INT);
  INSERT INTO t1 SELECT value, 1 FROM generate_series(1,256) WHERE value & 1;
  INSERT INTO t2 SELECT value, 1 FROM generate_series(1,256) WHERE value & 2;
  INSERT INTO t3 SELECT value, 1 FROM generate_series(1,256) WHERE value & 4;
  INSERT INTO t4 SELECT value, 1 FROM generate_series(1,256) WHERE value & 8;
  INSERT INTO t5 SELECT value, 1 FROM generate_series(1,256) WHERE value & 16;
  INSERT INTO t6 SELECT value, 1 FROM generate_series(1,256) WHERE value & 32;
  INSERT INTO t7 SELECT value, 1 FROM generate_series(1,256) WHERE value & 64;
  INSERT INTO t8 SELECT value, 1 FROM generate_series(1,256) WHERE value & 128;
  CREATE TABLE t9 AS
    SELECT id, h, g, f, e, d, c, b, a
      FROM t1
      NATURAL FULL JOIN t2
      NATURAL FULL JOIN t3
      NATURAL FULL JOIN t4
      NATURAL FULL JOIN t5
      NATURAL FULL JOIN t6
      NATURAL FULL JOIN t7
      NATURAL FULL JOIN t8;


  SELECT count(*) FROM t9;


  SELECT id, count(*) FROM t9 GROUP BY id HAVING count(*)!=1;


  UPDATE t9 SET a=0 WHERE a IS NULL;
  UPDATE t9 SET b=0 WHERE b IS NULL;
  UPDATE t9 SET c=0 WHERE c IS NULL;
  UPDATE t9 SET d=0 WHERE d IS NULL;
  UPDATE t9 SET e=0 WHERE e IS NULL;
  UPDATE t9 SET f=0 WHERE f IS NULL;
  UPDATE t9 SET g=0 WHERE g IS NULL;
  UPDATE t9 SET h=0 WHERE h IS NULL;
  SELECT count(*) FROM t9 WHERE id=128*h+64*g+32*f+16*e+8*d+4*c+2*b+a;


  SELECT * FROM t9 WHERE id<>128*h+64*g+32*f+16*e+8*d+4*c+2*b+a;


  CREATE TABLE t1(x INTEGER PRIMARY KEY, a, b);
  INSERT INTO t1 VALUES(1,5555,4);
  CREATE INDEX i1a ON t1(a);
  CREATE INDEX i1b ON t1(b);
  SELECT a FROM t1 NATURAL RIGHT JOIN t1 WHERE a=5555 OR (1,b)==(SELECT 2 IN (2,2),4);


  CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT, c TEXT, d REAL);
  INSERT INTO t1 VALUES(1,'A','aa',2.5);
  SELECT * FROM t1 AS t2 NATURAL RIGHT JOIN t1 AS t3
   WHERE (a,b) IN (SELECT rowid, b FROM t1);


  DROP TABLE IF EXISTS t1;
  CREATE TABLE t1(a INT PRIMARY KEY, b TEXT, c TEXT, d INT) WITHOUT ROWID;
  INSERT INTO t1 VALUES(15,'xray','baker',42);
  SELECT value, t1.* FROM json_each('7') NATURAL RIGHT JOIN t1
   WHERE (a,b) IN (SELECT a, b FROM t1);


  DROP TABLE IF EXISTS t1;
  CREATE TABLE t1(a INTEGER PRIMARY KEY,b);
  INSERT INTO t1 VALUES(0,NULL),(1,2);
  SELECT value, t1.* FROM json_each('17') NATURAL RIGHT JOIN t1
   WHERE (a,b) IN (SELECT rowid, b FROM t1);


  SELECT value, t1.* FROM json_each('null') NATURAL RIGHT JOIN t1
   WHERE (a,b) IN (SELECT rowid, b FROM t1);


  CREATE TABLE a(key TEXT);
  INSERT INTO a(key) VALUES('a'),('b');
  SELECT quote(a.key), b.value
    FROM a RIGHT JOIN json_each('["a","c"]') AS b ON a.key=b.value;


CREATE TABLE t1(a INT, b INT, c INT, d INT);
  WITH RECURSIVE c(x) AS (VALUES(0) UNION ALL SELECT x+1 FROM c WHERE x<10)
    INSERT INTO t1(a,b,c,d) SELECT x, x+100, x+200, x+300 FROM c;
  CREATE TABLE t2(b INT, x INT);
  INSERT INTO t2(b,x) SELECT b, a FROM t1 WHERE a%2=0;
  CREATE INDEX t2b ON t2(b);
  CREATE TABLE t3(c INT, y INT);
  INSERT INTO t3(c,y) SELECT c, a FROM t1 WHERE a%3=0;
  CREATE INDEX t3c ON t3(c);
  CREATE TABLE t4(d INT, z INT);
  INSERT INTO t4(d,z) SELECT d, a FROM t1 WHERE a%5=0;
  CREATE INDEX t4d ON t4(d);
  INSERT INTO t1(a,b,c,d) VALUES
    (96,NULL,296,396),
    (97,197,NULL,397),
    (98,198,298,NULL),
    (99,NULL,NULL,NULL);
  ANALYZE sqlite_schema;
  INSERT INTO sqlite_stat1 VALUES('t4','t4d','20 1');
  INSERT INTO sqlite_stat1 VALUES('t3','t3c','32 1');
  INSERT INTO sqlite_stat1 VALUES('t2','t2b','48 1');
  INSERT INTO sqlite_stat1 VALUES('t1',NULL,'100');
  ANALYZE sqlite_schema;


  WITH t0 AS MATERIALIZED (
    SELECT t1.*, t2.*, t3.*
      FROM t1 INNER JOIN t2 ON t1.b=t2.b AND t2.x>0
        RIGHT JOIN t3 ON t1.c=t3.c AND t3.y>0
  )
  SELECT * FROM t0 FULL JOIN t4 ON t0.a=t4.d AND t4.z>0
   ORDER BY coalesce(t0.a, t0.y+200, t4.d);


  WITH t0 AS MATERIALIZED (
    SELECT t1.*, t2.*, t3.*
      FROM t1 INNER JOIN t2 ON t1.b=t2.b AND t2.x>0
        RIGHT JOIN t3 ON t1.c=t3.c AND t3.y>0
  )
  SELECT * FROM t0 LEFT RIGHT JOIN t4 ON t0.a=t4.d AND t4.z>0
   ORDER BY coalesce(t0.a, t0.y+200, t4.d);


  EXPLAIN QUERY PLAN
  WITH t0 AS MATERIALIZED (
    SELECT t1.*, t2.*, t3.*
      FROM t1 INNER JOIN t2 ON t1.b=t2.b AND t2.x>0
        RIGHT JOIN t3 ON t1.c=t3.c AND t3.y>0
  )
  SELECT * FROM t0 FULL JOIN t4 ON t0.a=t4.d AND t4.z>0
   ORDER BY coalesce(t0.a, t0.y+200, t4.d);


  CREATE TABLE t1(a INT, b INT);
  CREATE TABLE t2(c INT, d INT);
  CREATE TABLE t3(e INT, f INT);
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t2 VALUES(3, 4);
  INSERT INTO t3 VALUES(5, 6);


  SELECT *
    FROM t3 LEFT JOIN t2 ON true
            JOIN t1 ON (t3.e IS t2.c);


  SELECT *
    FROM t3 LEFT JOIN t2 ON true
            JOIN t1 ON (t3.e IS NOT DISTINCT FROM t2.c);


  CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT, c TEXT, d REAL);
  INSERT INTO t1 VALUES(1,'E','bb',NULL),(2,NULL,NULL,NULL);
  SELECT * FROM t1 NATURAL RIGHT JOIN t1 AS t2 WHERE (a,b) IN (SELECT a+0, b FROM t1);


  CREATE TABLE t1(c0 INT UNIQUE);
  CREATE TABLE t2(c0);
  CREATE TABLE t2i(c0 INT);
  CREATE TABLE t3(c0 INT);
  INSERT INTO t1 VALUES(1);
  INSERT INTO t2 VALUES(2);
  INSERT INTO t2i VALUES(2);
  INSERT INTO t3 VALUES(3);


  SELECT DISTINCT t1.c0, t3.c0
    FROM t2 NATURAL JOIN t1 RIGHT JOIN t3 ON t1.c0;


  SELECT t1.c0, t3.c0
    FROM t2 NATURAL JOIN t1 RIGHT JOIN t3 ON t1.c0;


  SELECT DISTINCT t1.c0, t3.c0
    FROM t2 NATURAL CROSS JOIN t1 RIGHT JOIN t3 ON t1.c0;


  SELECT t1.c0, t3.c0
    FROM t1 NATURAL CROSS JOIN t2 RIGHT JOIN t3 ON t1.c0;


  SELECT DISTINCT t1.c0, t3.c0
    FROM t2i NATURAL JOIN t1 RIGHT JOIN t3 ON t1.c0;


  SELECT DISTINCT +t1.c0, t3.c0
    FROM t2 NATURAL JOIN t1 RIGHT JOIN t3 ON t1.c0;


  SELECT DISTINCT +t1.c0, t3.c0
    FROM t1 NATURAL CROSS JOIN t2 RIGHT JOIN t3 ON t1.c0;


  SELECT DISTINCT t1.c0, t3.c0
    FROM t2 NATURAL JOIN t1 RIGHT JOIN t3 ON t1.c0<>0;


  CREATE TABLE t1(a);
  CREATE TABLE t2(b);
  INSERT INTO t2 VALUES(0),(1),(2);
  SELECT * FROM t1 RIGHT JOIN t2 ON (a=b) WHERE 99+(b+1)!=99;


  CREATE INDEX t2b ON t2(b+1) WHERE b IS NOT NULL;
  SELECT * FROM t1 RIGHT JOIN t2 ON (a=b) WHERE 99+(b+1)!=99;


  DROP TABLE t1;
  DROP TABLE t2;
  CREATE TABLE t1(a);
  CREATE TABLE t2(b, c, d);
  INSERT INTO t2 VALUES(1, 3, 'not-4');
  SELECT b, d FROM t1 RIGHT JOIN t2 WHERE (b+0)=1 AND d!=4;


  CREATE INDEX i2 ON t2((b+0), d);
  SELECT b, d FROM t1 RIGHT JOIN t2 WHERE (b+0)=1 AND d!=4;


  DROP INDEX i2;
  CREATE INDEX i2 ON t2((b+0), d) WHERE d IS NOT NULL;
  SELECT b, d FROM t1 RIGHT JOIN t2 WHERE (b+0)=1 AND d!=4;


  CREATE TABLE t1(a INT);  INSERT INTO t1 VALUES(0),(1);
  CREATE TABLE t2(a INT);  INSERT INTO t2 VALUES(0),(2);
  CREATE TABLE t3(a INT);  INSERT INTO t3 VALUES(0),(3);


  CREATE TABLE t0(t TEXT, u TEXT);  INSERT INTO t0 VALUES('t', 'u');
  CREATE TABLE t1(v TEXT, w TEXT);  INSERT INTO t1 VALUES('v', 'w');
  CREATE TABLE t2(x TEXT, y TEXT);  INSERT INTO t2 VALUES('x', 'y');
  SELECT * FROM t0 JOIN t1 ON (t2.x NOTNULL) LEFT JOIN t2 ON false;
  SELECT * FROM t0 JOIN t1 ON (t2.x NOTNULL) LEFT JOIN t2 ON false
   WHERE t2.y ISNULL;


  CREATE TABLE t0(a TEXT, b TEXT, c TEXT);
  CREATE TABLE t1(a TEXT);
  INSERT INTO t1 VALUES('1');
  CREATE VIEW v0 AS SELECT 'xyz' AS d;
  SELECT * FROM v0 RIGHT JOIN t1 ON t1.a<>'' INNER JOIN t0 ON t0.c<>'';
  SELECT * FROM v0 RIGHT JOIN t1 ON t1.a<>'' INNER JOIN t0 ON t0.c<>'' WHERE b ISNULL;


  CREATE TABLE y0(a INT);
  CREATE TABLE y1(b INT); INSERT INTO y1 VALUES(1), (2);
  CREATE TABLE y2(c INT); INSERT INTO y2 VALUES(3), (4);


  SELECT * FROM y0 RIGHT JOIN y1 ON true INNER JOIN y2 ON true WHERE y2.c!=99 AND y2.c!=98;


  CREATE TABLE t1(x INT);
  CREATE TABLE t2(y INT);
  CREATE TABLE t3(z INT);
  INSERT INTO t1 VALUES(10);
  INSERT INTO t3 VALUES(20),(30);


  SELECT * FROM t1 LEFT JOIN t2 ON true JOIN t3 ON t2.y IS NOT NULL;


  SELECT * FROM t1 LEFT JOIN t2 ON true JOIN t3 ON t2.y IS NOT NULL
   WHERE (t3.z!=400 AND t3.z!=500 AND t3.z!=600);


  PRAGMA automatic_index = 0;
  CREATE TABLE t4(x TEXT);
  CREATE TABLE t5(y TEXT);
  CREATE TABLE t6(z TEXT);
  INSERT INTO t4 VALUES('a'), ('b');
  INSERT INTO t5 VALUES('b'), ('c');
  INSERT INTO t6 VALUES('a'), ('d');


  SELECT * FROM t4 LEFT JOIN t5 ON x=y LEFT JOIN t6 ON (x=z) ORDER BY +x;


  SELECT * FROM t4 LEFT JOIN t5 ON x=y LEFT JOIN t6 ON (x=z)
   WHERE t5.y!='x' AND t4.x!='x';


  CREATE TABLE t1(a TEXT);
  CREATE TABLE t2(b TEXT);
  CREATE TABLE t3(c TEXT);
  INSERT INTO t2(b) VALUES ('x');
  INSERT INTO t3(c) VALUES ('y'), ('z');


  SELECT * FROM t1 RIGHT JOIN t2 ON true LEFT JOIN t3 ON a<>'';


  SELECT * FROM t1 RIGHT JOIN t2 ON true LEFT JOIN t3 ON a<>'' WHERE c IS NULL;


  SELECT * FROM t1 RIGHT JOIN t2 ON true JOIN t3 ON a<>'' WHERE c IS NULL;


  SELECT * FROM t1 RIGHT JOIN t2 ON true JOIN t3 ON a<>'';


  SELECT * FROM t1 RIGHT JOIN t2 ON true LEFT JOIN t3 ON a<>'' WHERE c<>'';


  SELECT * FROM t1 RIGHT JOIN t2 ON true LEFT JOIN t3 ON a<>'' WHERE c IS NOT NULL;


  SELECT * FROM t1 RIGHT JOIN t2 ON true JOIN t3 ON a<>'' WHERE c<>'';


  SELECT * FROM t1 RIGHT JOIN t2 ON true JOIN t3 ON a<>'' WHERE c IS NOT NULL;


  CREATE TABLE t1(id INTEGER PRIMARY KEY, x INT, y INT);
  CREATE TABLE t2(z INT);
  INSERT INTO t1(id,x,y) VALUES(1, 0, 0);


  SELECT * FROM t2 RIGHT JOIN t1 ON true;


  SELECT 99=id AND 0=y AS "truth" FROM t2 RIGHT JOIN t1 ON true;


  SELECT (99, 0)==(id, y) AS "truth" FROM t2 RIGHT JOIN t1;


  SELECT * FROM t2 RIGHT JOIN t1 WHERE 99=id AND 0=y;


  SELECT * FROM t2 RIGHT JOIN t1 WHERE 99=+id AND 0=y;


  SELECT * FROM t2 RIGHT JOIN t1 WHERE (99, 0)==(id,y);


  SELECT * FROM t2 RIGHT JOIN t1 WHERE (99, 0)==(+id,y);


  SELECT * FROM t2 RIGHT JOIN t1 WHERE 1=id AND 0=y;


  SELECT * FROM t2 RIGHT JOIN t1 WHERE 1=+id AND 0=y;


  SELECT * FROM t2 RIGHT JOIN t1 WHERE (1, 0)==(id,y);


  SELECT * FROM t2 RIGHT JOIN t1 WHERE (1, 0)==(+id,y);


  CREATE TABLE t3(a INTEGER PRIMARY KEY, b INT);
  CREATE TABLE t4(x INT, y INT);
  INSERT INTO t3(a,b) VALUES(1, 3);


  SELECT t3.a FROM t4 RIGHT JOIN t3 ON (x=a) WHERE (b, 4)=(SELECT 3, 4);


  SELECT t3.a FROM t4 RIGHT JOIN t3 ON (x=a) WHERE (b, 4) IS (SELECT 3, 4);


  CREATE TABLE t1(a BOOLEAN); INSERT INTO t1 VALUES (false);
  CREATE TABLE t2(x INT);     INSERT INTO t2 VALUES (0);
  SELECT *, x NOTNULL, (x NOTNULL)=a FROM t2 RIGHT JOIN t1 ON true WHERE (x NOTNULL)=a;


  CREATE INDEX t1a ON t1(a);
  SELECT *, x NOTNULL, (x NOTNULL)=a FROM t2 RIGHT JOIN t1 ON true WHERE (x NOTNULL)=a;


  CREATE TABLE t3(z);
  INSERT INTO t3 VALUES('t3value');
  SELECT *, x NOTNULL, (x NOTNULL)=a FROM t2 RIGHT JOIN t1 ON true INNER JOIN t3 ON (x NOTNULL)=a;


    CREATE VIRTUAL TABLE rtree1 USING rtree(a, x1, x2);
    INSERT INTO rtree1 VALUES(0, 0, 0);
  

    SELECT *, x NOTNULL, (x NOTNULL)=a FROM t2 
      RIGHT JOIN rtree1 ON true INNER JOIN t3 ON (x NOTNULL)=+a;
  

    SELECT *, x NOTNULL, (x NOTNULL)=a FROM t2 
      RIGHT JOIN rtree1 ON true INNER JOIN t3 ON (x NOTNULL)=a;
  

  CREATE TABLE t1(a INT);
  CREATE TABLE t2(b INT, c INT);
  CREATE TABLE t3(d INT);

  INSERT INTO t1 VALUES(10);
  INSERT INTO t2 VALUES(50,51);
  INSERT INTO t3 VALUES(299);

  CREATE INDEX t2b ON t2( (b IS NOT NULL) );


  SELECT * FROM t1 LEFT JOIN t2 ON true INNER JOIN t3 ON (b IS NOT NULL)=0;


  CREATE TABLE t1(x TEXT);
  INSERT INTO t1(x) VALUES('aaa');
  CREATE VIEW v0(y) AS SELECT x FROM t1;
  CREATE TABLE t2(z TEXT);


  SELECT * FROM t2 JOIN v0 ON z<>'bbb' RIGHT JOIN t1 ON z<>'ccc';


  SELECT * FROM t2 JOIN v0 ON z<>'bbb' RIGHT JOIN t1 ON z<>'ccc' ORDER BY z;


  SELECT 99 as "m" FROM t2 JOIN v0 ON z<>'bbb' RIGHT JOIN t1 ON z<>'ccc';


  SELECT 99 as "m" FROM t2 JOIN v0 ON z<>'bbb' RIGHT JOIN t1 ON z<>'ccc' ORDER BY z;


  SELECT count(*)
    FROM (SELECT 99 as "m" FROM t2 JOIN v0 ON z<>'' RIGHT JOIN t1 ON z<>'') AS "t3";


  SELECT count(*) 
    FROM (SELECT 99 as "m" FROM t2 JOIN v0 ON z<>'' RIGHT JOIN t1 ON z<>'' ORDER BY z) AS "t3";


  CREATE TABLE t1(a INT,b BOOLEAN);
  CREATE TABLE t2(c INT);  INSERT INTO t2 VALUES(NULL);
  CREATE TABLE t3(d INT);


  SELECT (b IS TRUE) FROM t1 JOIN t3 ON (b=TRUE) RIGHT JOIN t2 ON TRUE;


  SELECT * FROM t1 JOIN t3 ON (b=TRUE) RIGHT JOIN t2 ON TRUE WHERE (b IS TRUE);


  DROP TABLE t1;
  DROP TABLE t2;
  DROP TABLE t3;
  CREATE TABLE t1(a INT);
  CREATE TABLE t2(b INT);
  CREATE TABLE t3(c INTEGER PRIMARY KEY, d INT);
  CREATE INDEX t3d ON t3(d);
  INSERT INTO t3 VALUES(0, 0);


  CREATE TABLE t1(a INT);
  CREATE TABLE t2(b INT);
  CREATE TABLE t3(c TEXT);  INSERT INTO t3 VALUES('x');
  CREATE TABLE t4(d TEXT);  INSERT INTO t4 VALUES('y');
  SELECT 99
    FROM t1
         LEFT JOIN t2 ON true
         RIGHT JOIN t3 ON true
         RIGHT JOIN t4 ON true
   WHERE a=b;


  CREATE TABLE t1(a TEXT);
  INSERT INTO t1 VALUES('c');
  CREATE TABLE t2(b TEXT, c TEXT NOT NULL);
  INSERT INTO t2 VALUES('a', 'b');
  CREATE TABLE t3(d TEXT);
  INSERT INTO t3 VALUES('x');
  CREATE TABLE t4(e TEXT);
  INSERT INTO t4 VALUES('y');


  SELECT *
    FROM t1
         LEFT JOIN t2 ON TRUE
         JOIN t3 ON c=''
         RIGHT JOIN t4 ON b='';


  SELECT *
    FROM t1
         LEFT JOIN t2 ON TRUE
         JOIN t3 ON c=''
         RIGHT JOIN t4 ON b=''
   WHERE d ISNULL


  CREATE TABLE t4(b INT, c INT);
  CREATE TABLE t5(a INT, f INT);
  INSERT INTO t5 VALUES(1,2);
  WITH t7(x, y) AS (SELECT 100, 200 FROM t5)
    SELECT * FROM t4 JOIN t7 ON true RIGHT JOIN (SELECT y AS z FROM t7) AS t6 ON (x=z);


  CREATE TABLE t1(a1 INT);
  CREATE TABLE t2(b2 INT);
  CREATE TABLE t3(c3 INT, d3 INT UNIQUE);
  CREATE TABLE t4(e4 INT, f4 TEXT);
  INSERT INTO t3(c3, d3) VALUES (2, 1);
  INSERT INTO t4(f4) VALUES ('x');
  CREATE INDEX i0 ON t3(c3) WHERE d3 ISNULL;
  ANALYZE main;


  SELECT * FROM t1 LEFT JOIN t2 ON true JOIN t3 ON (b2 IN (a1)) FULL JOIN t4 ON true;


  SELECT 1 FROM t1 LEFT JOIN t2 ON true JOIN t3 ON (b2 IN (a1)) FULL JOIN t4 ON true;


  CREATE TABLE t1(a INT);
  CREATE TABLE t2(b INT, c INT);
  CREATE VIEW t3(d) AS SELECT NULL FROM t2 FULL OUTER JOIN t1 ON c=a UNION ALL SELECT b FROM t2;
  INSERT INTO t1(a) VALUES (NULL);
  INSERT INTO t2(b, c) VALUES (99, NULL);
  SELECT DISTINCT b, c, d FROM t2, t3 WHERE b<>0
   UNION SELECT DISTINCT b, c, d FROM t2, t3 WHERE b ISNULL;