# name: test/sql/merge/merge_into.test
# description: Test MERGE INTO
# group: [merge]

statement ok
PRAGMA enable_verification

statement ok
CREATE TABLE Stock(item_id int, balance int);

statement ok
CREATE TABLE Buy(item_id int, volume int);

statement ok
INSERT INTO Buy values(10, 1000);

statement ok
INSERT INTO Buy values(30, 300);

# insert using merge into with a CTE
query I
WITH initial_stocks(item_id, balance) AS (VALUES (10, 2200), (20, 1900))
MERGE INTO Stock USING initial_stocks ON FALSE
WHEN MATCHED THEN DO NOTHING
WHEN NOT MATCHED THEN INSERT VALUES (initial_stocks.item_id, initial_stocks.balance)
----
2

# DO NOTHING is the default - this is a nop
query I
WITH initial_stocks(item_id, balance) AS (VALUES (10, 2200), (20, 1900))
MERGE INTO Stock USING initial_stocks USING (item_id)
WHEN NOT MATCHED THEN INSERT VALUES (item_id, initial_stocks.balance)
----
0

query II
FROM Stock ORDER BY item_id
----
10	2200
20	1900

# update and insert
query I
MERGE INTO Stock AS s USING Buy AS b ON s.item_id = b.item_id
WHEN MATCHED THEN UPDATE SET balance = balance + b.volume
WHEN NOT MATCHED THEN INSERT VALUES (b.item_id, b.volume)
----
2

query II
FROM Stock ORDER BY item_id
----
10	3200
20	1900
30	300

# sell - deleting all rows that are fully sold
statement ok
CREATE TABLE Sale(item_id int, volume int);

statement ok
INSERT INTO Sale VALUES (10, 2200);

statement ok
INSERT INTO Sale VALUES (20, 1900);

query I
MERGE INTO Stock USING Sale ON Stock.item_id = Sale.item_id
WHEN MATCHED AND Sale.volume > balance THEN ERROR
WHEN MATCHED AND Sale.volume = balance THEN DELETE
WHEN MATCHED AND TRUE THEN UPDATE SET balance = balance - Sale.volume
WHEN MATCHED THEN ERROR
WHEN NOT MATCHED THEN ERROR
----
2

query II
FROM Stock ORDER BY item_id
----
10	1000
30	300

# abort - row does not exist
statement error
MERGE INTO Stock USING Sale ON Stock.item_id = Sale.item_id
WHEN MATCHED AND Sale.volume >= balance THEN DELETE
WHEN MATCHED THEN UPDATE SET balance = balance - Sale.volume
WHEN NOT MATCHED THEN ERROR CONCAT('Sale item with item id ', Sale.item_id, ' not found');
----
Sale item with item id 20 not found

# we need to specify at least one match action
statement error
WITH initial_stocks(item_id, balance) AS (VALUES (10, 2200), (20, 1900))
MERGE INTO Stock USING initial_stocks ON (Stock.item_id = initial_stocks.item_id)
----
Parser

# we cannot specify an unconditional WHEN NOT MATCHED clause
statement error
WITH initial_stocks(item_id, balance) AS (VALUES (10, 2200), (20, 1900))
MERGE INTO Stock USING initial_stocks ON (Stock.item_id = initial_stocks.item_id)
WHEN NOT MATCHED THEN INSERT VALUES (initial_stocks.item_id, initial_stocks.balance)
WHEN NOT MATCHED THEN ERROR;
----
only one unconditional WHEN NOT MATCHED clause

# we cannot merge into views
statement ok
CREATE VIEW my_view AS SELECT 42 item_id

statement error
MERGE INTO my_view USING Sale ON my_view.item_id = Sale.item_id
WHEN NOT MATCHED THEN INSERT
----
base tables