mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-12-15 07:29:41 +00:00
140 lines
4.2 KiB
Plaintext
140 lines
4.2 KiB
Plaintext
|
|
CREATE TABLE people(
|
|
name TEXT PRIMARY KEY,
|
|
role TEXT NOT NULL,
|
|
height INT NOT NULL, -- in cm
|
|
CHECK( role IN ('student','teacher') )
|
|
);
|
|
CREATE INDEX people_idx1 ON people(role, height);
|
|
|
|
|
|
INSERT INTO people VALUES('Alice','student',156);
|
|
INSERT INTO people VALUES('Bob','student',161);
|
|
INSERT INTO people VALUES('Cindy','student',155);
|
|
INSERT INTO people VALUES('David','student',181);
|
|
INSERT INTO people VALUES('Emily','teacher',158);
|
|
INSERT INTO people VALUES('Fred','student',163);
|
|
INSERT INTO people VALUES('Ginny','student',169);
|
|
INSERT INTO people VALUES('Harold','student',172);
|
|
INSERT INTO people VALUES('Imma','student',179);
|
|
INSERT INTO people VALUES('Jack','student',181);
|
|
INSERT INTO people VALUES('Karen','student',163);
|
|
INSERT INTO people VALUES('Logan','student',177);
|
|
INSERT INTO people VALUES('Megan','teacher',159);
|
|
INSERT INTO people VALUES('Nathan','student',163);
|
|
INSERT INTO people VALUES('Olivia','student',161);
|
|
INSERT INTO people VALUES('Patrick','teacher',180);
|
|
INSERT INTO people VALUES('Quiana','student',182);
|
|
INSERT INTO people VALUES('Robert','student',159);
|
|
INSERT INTO people VALUES('Sally','student',166);
|
|
INSERT INTO people VALUES('Tom','student',171);
|
|
INSERT INTO people VALUES('Ursula','student',170);
|
|
INSERT INTO people VALUES('Vance','student',179);
|
|
INSERT INTO people VALUES('Willma','student',175);
|
|
INSERT INTO people VALUES('Xavier','teacher',185);
|
|
INSERT INTO people VALUES('Yvonne','student',149);
|
|
INSERT INTO people VALUES('Zach','student',170);
|
|
|
|
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
EXPLAIN QUERY PLAN
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
ANALYZE;
|
|
-- We do not have enough people above to actually force the use
|
|
-- of a skip-scan. So make a manual adjustment to the stat1 table
|
|
-- to make it seem like there are many more.
|
|
UPDATE sqlite_stat1 SET stat='10000 5000 20' WHERE idx='people_idx1';
|
|
UPDATE sqlite_stat1 SET stat='10000 1' WHERE idx='sqlite_autoindex_people_1';
|
|
ANALYZE sqlite_master;
|
|
|
|
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
EXPLAIN QUERY PLAN
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
SELECT name FROM people
|
|
WHERE role IN (SELECT DISTINCT role FROM people)
|
|
AND height>=180 ORDER BY +name;
|
|
|
|
|
|
SELECT name FROM people WHERE role='teacher' AND height>=180
|
|
UNION ALL
|
|
SELECT name FROM people WHERE role='student' AND height>=180
|
|
ORDER BY 1;
|
|
|
|
|
|
INSERT INTO people VALUES('Angie','student',166);
|
|
INSERT INTO people VALUES('Brad','student',176);
|
|
INSERT INTO people VALUES('Claire','student',168);
|
|
INSERT INTO people VALUES('Donald','student',162);
|
|
INSERT INTO people VALUES('Elaine','student',177);
|
|
INSERT INTO people VALUES('Frazier','student',159);
|
|
INSERT INTO people VALUES('Grace','student',179);
|
|
INSERT INTO people VALUES('Horace','student',166);
|
|
ANALYZE;
|
|
SELECT stat FROM sqlite_stat1 WHERE idx='people_idx1';
|
|
|
|
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
EXPLAIN QUERY PLAN
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
INSERT INTO people VALUES('Ingrad','student',155);
|
|
INSERT INTO people VALUES('Jacob','student',179);
|
|
ANALYZE;
|
|
SELECT stat FROM sqlite_stat1 WHERE idx='people_idx1';
|
|
|
|
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
EXPLAIN QUERY PLAN
|
|
SELECT name FROM people WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
CREATE TABLE peoplew(
|
|
name TEXT PRIMARY KEY,
|
|
role TEXT NOT NULL,
|
|
height INT NOT NULL, -- in cm
|
|
CHECK( role IN ('student','teacher') )
|
|
) WITHOUT ROWID;
|
|
CREATE INDEX peoplew_idx1 ON peoplew(role, height);
|
|
INSERT INTO peoplew(name,role,height)
|
|
SELECT name, role, height FROM people;
|
|
SELECT name FROM peoplew WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
SELECT name FROM peoplew
|
|
WHERE role IN (SELECT DISTINCT role FROM peoplew)
|
|
AND height>=180 ORDER BY +name;
|
|
|
|
|
|
SELECT name FROM peoplew WHERE role='teacher' AND height>=180
|
|
UNION ALL
|
|
SELECT name FROM peoplew WHERE role='student' AND height>=180
|
|
ORDER BY 1;
|
|
|
|
|
|
ANALYZE;
|
|
|
|
|
|
SELECT name FROM peoplew WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
EXPLAIN QUERY PLAN
|
|
SELECT name FROM peoplew WHERE height>=180 ORDER BY +name;
|
|
|
|
|
|
CREATE TABLE t3(a, b, c, PRIMARY KEY(a, b)) WITHOUT ROWID;
|
|
|