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use test;
use sql;
use core:io;
DATABASE JoinDB {
TABLE textA(
id INTEGER PRIMARY KEY,
b INTEGER,
value TEXT
);
TABLE textB(
id INTEGER PRIMARY KEY,
c INTEGER,
value TEXT
);
TABLE textC(
id INTEGER PRIMARY KEY,
value TEXT
);
}
JoinDB joinDB() {
SQLite db;
JoinDB c(db);
WITH c {
INSERT INTO textC VALUES (1, "i");
INSERT INTO textC VALUES (2, "ii");
INSERT INTO textC VALUES (3, "iii");
INSERT INTO textC VALUES (4, "iv");
INSERT INTO textB VALUES (1, 2, "one");
INSERT INTO textB VALUES (2, 3, "two");
INSERT INTO textB VALUES (3, 4, "three");
INSERT INTO textB VALUES (4, 5, "four");
INSERT INTO textA VALUES (1, 2, "1");
INSERT INTO textA VALUES (2, 3, "2");
INSERT INTO textA VALUES (3, 4, "3");
INSERT INTO textA VALUES (4, 5, "4");
};
return c;
}
test JoinInner {
var db = joinDB();
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value
FROM textA
JOIN textB ON textA.b == textB.id;
Nat rows;
for (row in res) {
rows++;
// print(row.toS);
}
check rows == 3;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
JOIN textB ON textA.b == textB.id
JOIN textC ON textB.c == textC.id;
Nat rows;
for (row in res) {
rows++;
// print(row.toS);
}
check rows == 2;
}
}
test JoinLeft {
var db = joinDB();
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value
FROM textA
LEFT JOIN textB ON textA.b == textB.id;
Nat rows;
Nat rightNull;
for (row in res) {
rows++;
if (row.textB.empty)
rightNull++;
// print(row.toS);
}
check rows == 4;
check rightNull == 1;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
LEFT JOIN textB ON textA.b == textB.id
LEFT JOIN textC ON textB.c == textC.id;
Nat rows;
Nat bNull;
Nat cNull;
for (row in res) {
rows++;
if (row.textB.empty)
bNull++;
if (row.textC.empty)
cNull++;
// print(row.toS);
}
check rows == 4;
check bNull == 1;
check cNull == 2;
}
}
test JoinRight {
var db = joinDB();
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value
FROM textA
RIGHT JOIN textB ON textA.b == textB.id;
Nat rows;
Nat leftNull;
for (row in res) {
rows++;
if (row.textA.empty)
leftNull++;
// print(row.toS);
}
check rows == 4;
check leftNull == 1;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
RIGHT JOIN textB ON textA.b == textB.id
RIGHT JOIN textC ON textB.c == textC.id;
Nat rows;
Nat aNull;
Nat bNull;
for (row in res) {
rows++;
if (row.textA.empty)
aNull++;
if (row.textB.empty)
bNull++;
// print(row.toS);
}
check rows == 4;
check aNull == 2;
check bNull == 1;
}
}
test JoinFull {
var db = joinDB();
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value
FROM textA
FULL JOIN textB ON textA.b == textB.id;
Nat rows;
Nat leftNull;
Nat rightNull;
for (row in res) {
rows++;
if (row.textA.empty)
leftNull++;
if (row.textB.empty)
rightNull++;
// print(row.toS);
}
check rows == 5;
check leftNull == 1;
check rightNull == 1;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
FULL JOIN textB ON textA.b == textB.id
FULL JOIN textC ON textB.c == textC.id;
Nat rows;
Nat aNull;
Nat bNull;
Nat cNull;
for (row in res) {
rows++;
if (row.textA.empty)
aNull++;
if (row.textB.empty)
bNull++;
if (row.textC.empty)
cNull++;
// print(row.toS);
}
check rows == 6;
check aNull == 2;
check bNull == 2;
check cNull == 2;
}
}
test JoinMixed {
var db = joinDB();
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
LEFT JOIN textB ON textA.b == textB.id
RIGHT JOIN textC ON textB.c == textC.id;
Nat rows;
Nat aNull;
Nat bNull;
for (row in res) {
rows++;
if (row.textA.empty)
aNull++;
if (row.textB.empty)
bNull++;
// print(row.toS);
}
check rows == 4;
check aNull == 2;
check bNull == 2;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
RIGHT JOIN textB ON textA.b == textB.id
LEFT JOIN textC ON textB.c == textC.id;
Nat rows;
Nat aNull;
Nat cNull;
for (row in res) {
rows++;
if (row.textA.empty)
aNull++;
if (row.textC.empty)
cNull++;
// print(row.toS);
}
check rows == 4;
check aNull == 1;
check cNull == 1;
}
{
var res = WITH db: SELECT textA.id, textA.value, textB.id, textB.value, textC.id, textC.value
FROM textA
FULL JOIN textB ON textA.b == textB.id
RIGHT JOIN textC ON textB.c == textC.id;
Nat rows;
Nat aNull;
Nat bNull;
for (row in res) {
rows++;
if (row.textA.empty)
aNull++;
if (row.textB.empty)
bNull++;
// print(row.toS);
}
check rows == 4;
check aNull == 2;
check bNull == 1;
}
}
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