Практика 'Materialized View (MV)' - Clickhouse

mnoskov/clickhouse/Практика clickhouse/4. Streaming в Clickhouse/1. Materialized View (MV)/practice_materialized_view_MV.sql

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+-- Задание 1
+
+--DROP TABLE mnoskov.raw_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.raw_events
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/raw_events',
+    '{replica}'
+)
+ORDER BY ts;
+
+--DROP TABLE mnoskov.clean_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.clean_events
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/clean_events',
+    '{replica}'
+)
+ORDER BY ts;
+
+CREATE MATERIALIZED VIEW mnoskov.mv_clean
+ON CLUSTER clickhouse_cluster
+TO mnoskov.clean_events
+AS
+SELECT
+	user_id,
+	ts,
+	nullif(event_type, '') AS event_type -- это я сделать чтобы выводилось NULL а не '' - пустая строка.
+FROM mnoskov.raw_events
+WHERE user_id != 0 AND event_type IS NOT NULL
+ORDER BY ts;
+
+-- Тесты:
+SELECT * FROM raw_events;
+SELECT * FROM mnoskov.mv_clean;
+
+TRUNCATE TABLE mnoskov.raw_events ON CLUSTER clickhouse_cluster sync;
+INSERT INTO mnoskov.raw_events
+(user_id, ts, event_type)
+VALUES
+(0, '2024-07-17 10:00:00', 'click'),
+(1, '2024-07-17 10:01:00', 'view'),
+(2, '2024-07-17 10:02:00', NULL);
+
+
+-- Задание 2
+
+--raw_events
+--DROP TABLE mnoskov.raw_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.raw_events
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/raw_events',
+    '{replica}'
+)
+ORDER BY ts;
+
+--click_events
+--DROP TABLE mnoskov.click_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.click_events
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/click_events',
+    '{replica}'
+)
+ORDER BY ts;
+
+--login_events
+--DROP TABLE mnoskov.login_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.login_events1
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/login_events1',
+    '{replica}'
+)
+ORDER BY ts;
+
+--purchase_events
+--DROP TABLE mnoskov.purchase_events ON CLUSTER clickhouse_cluster sync;
+CREATE TABLE mnoskov.purchase_events1
+ON CLUSTER clickhouse_cluster
+(
+	user_id UInt64,
+	ts DateTime,
+	event_type String
+)
+ENGINE = ReplicatedMergeTree(
+    '/clickhouse/tables/{shard}/mnoskov/purchase_events1',
+    '{replica}'
+)
+ORDER BY ts;
+
+--mv_click
+--DROP VIEW mnoskov.mv_click ON CLUSTER clickhouse_cluster sync;
+CREATE MATERIALIZED VIEW mnoskov.mv_click
+ON CLUSTER clickhouse_cluster
+TO mnoskov.click_events
+AS
+SELECT * FROM mnoskov.raw_events WHERE event_type = 'click'
+ORDER BY ts;
+
+--mv_login
+--DROP VIEW mnoskov.mv_login ON CLUSTER clickhouse_cluster sync;
+CREATE MATERIALIZED VIEW mnoskov.mv_login
+ON CLUSTER clickhouse_cluster
+TO mnoskov.login_events1
+AS
+SELECT * FROM mnoskov.raw_events WHERE event_type = 'login'
+ORDER BY ts;
+
+--mv_purchase
+--DROP VIEW mnoskov.mv_purchase ON CLUSTER clickhouse_cluster sync;
+CREATE MATERIALIZED VIEW mnoskov.mv_purchase
+ON CLUSTER clickhouse_cluster
+TO mnoskov.purchase_events1
+AS
+SELECT * FROM mnoskov.raw_events WHERE event_type = 'purchase'
+ORDER BY ts;
+
+
+-- Тесты:
+SELECT * FROM mnoskov.click_events;
+SELECT * FROM mnoskov.login_events1;
+SELECT * FROM mnoskov.purchase_events1;
+
+TRUNCATE TABLE mnoskov.raw_events ON CLUSTER clickhouse_cluster sync;
+INSERT INTO mnoskov.raw_events
+(user_id, ts, event_type)
+VALUES
+(1, '2024-07-17 10:00:00', 'click'),
+(2, '2024-07-17 10:01:00', 'login'),
+(3, '2024-07-17 10:02:00', 'purchase');