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+---
+title: "Use both projection and raw data in single query"
+linkTitle: "partial-projection-optimization"
+description: >
+    How to write queries, which will use both data from projection and raw table.
+---
+
+```sql
+CREATE TABLE default.metric
+(
+    `key_a` UInt8,
+    `key_b` UInt32,
+    `date` Date,
+    `value` UInt32,
+    PROJECTION monthly
+    (
+        SELECT
+            key_a,
+            key_b,
+            min(date),
+            sum(value)
+        GROUP BY
+            key_a,
+            key_b
+    )
+)
+ENGINE = MergeTree
+PARTITION BY toYYYYMM(date)
+ORDER BY (key_a, key_b, date)
+SETTINGS index_granularity = 8192;
+
+
+INSERT INTO metric SELECT
+    key_a,
+    key_b,
+    date,
+    rand() % 100000 AS value
+FROM
+(
+    SELECT
+        arrayJoin(range(8)) AS key_a,
+        number % 500000 AS key_b,
+        today() - intDiv(number, 500000) AS date
+    FROM numbers_mt(1080000000)
+);
+
+OPTIMIZE TABLE metric FINAL;
+
+SET max_threads = 8;
+
+WITH
+    toDate('2015-02-27') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM metric
+WHERE (date > start_date) AND (date < end_date) AND key_a_cond
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 6.561 sec. Processed 4.32 billion rows, 47.54 GB (658.70 million rows/s., 7.25 GB/s.)
+
+WITH
+    toDate('2015-02-27') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM
+(
+    SELECT
+        key_b,
+        value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST([toYYYYMM(start_date), toYYYYMM(end_date)], 'Array(String)')) AND (date > start_date) AND (date < end_date) AND key_a_cond
+    UNION ALL
+    SELECT
+        key_b,
+        sum(value) AS value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST(range(toYYYYMM(start_date) + 1, toYYYYMM(end_date)), 'Array(String)')) AND key_a_cond
+    GROUP BY key_b
+)
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 1.038 sec. Processed 181.86 million rows, 4.56 GB (175.18 million rows/s., 4.40 GB/s.)
+
+
+WITH
+    (toDate('2016-02-27'), toDate('2017-02-15')) AS period_1,
+    (toDate('2018-05-27'), toDate('2022-08-15')) AS period_2,
+    (date > (period_1.1)) AND (date < (period_1.2)) AS period_1_cond,
+    (date > (period_2.1)) AND (date < (period_2.2)) AS period_2_cond,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sumIf(value, period_1_cond) AS sum_per_1,
+    sumIf(value, period_2_cond) AS sum_per_2
+FROM metric
+WHERE (period_1_cond OR period_2_cond) AND key_a_cond
+GROUP BY key_b
+ORDER BY sum_per_2 / sum_per_1 DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 5.717 sec. Processed 3.47 billion rows, 38.17 GB (606.93 million rows/s., 6.68 GB/s.)
+
+WITH
+    (toDate('2016-02-27'), toDate('2017-02-15')) AS period_1,
+    (toDate('2018-05-27'), toDate('2022-08-15')) AS period_2,
+    (date > (period_1.1)) AND (date < (period_1.2)) AS period_1_cond,
+    (date > (period_2.1)) AND (date < (period_2.2)) AS period_2_cond,
+    CAST([toYYYYMM(period_1.1), toYYYYMM(period_1.2), toYYYYMM(period_2.1), toYYYYMM(period_2.2)], 'Array(String)') AS daily_parts,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sumIf(value, period_1_cond) AS sum_per_1,
+    sumIf(value, period_2_cond) AS sum_per_2
+FROM
+(
+    SELECT
+        key_b,
+        date,
+        value
+    FROM metric
+    WHERE indexHint(_partition_id IN (daily_parts)) AND (period_1_cond OR period_2_cond) AND key_a_cond
+    UNION ALL
+    SELECT
+        key_b,
+        min(date) AS date,
+        sum(value) AS value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST(arrayConcat(range(toYYYYMM(period_1.1) + 1, toYYYYMM(period_1.2)), range(toYYYYMM(period_2.1) + 1, toYYYYMM(period_2.1))), 'Array(String)')) AND indexHint(_partition_id NOT IN (daily_parts)) AND key_a_cond
+    GROUP BY
+        key_b
+)
+GROUP BY key_b
+ORDER BY sum_per_2 / sum_per_1 DESC
+LIMIT 25
+
+
+25 rows in set. Elapsed: 0.444 sec. Processed 140.34 million rows, 2.11 GB (316.23 million rows/s., 4.77 GB/s.)
+
+
+WITH
+    toDate('2022-01-03') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM metric
+WHERE (date > start_date) AND (date < end_date) AND key_a_cond
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 0.208 sec. Processed 100.06 million rows, 1.10 GB (481.06 million rows/s., 5.29 GB/s.)
+
+
+WITH
+    toDate('2022-01-03') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM
+(
+    SELECT
+        key_b,
+        value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST([toYYYYMM(start_date), toYYYYMM(end_date)], 'Array(String)')) AND (date > start_date) AND (date < end_date) AND key_a_cond
+    UNION ALL
+    SELECT
+        key_b,
+        sum(value) AS value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST(range(toYYYYMM(start_date) + 1, toYYYYMM(end_date)), 'Array(String)')) AND key_a_cond
+    GROUP BY key_b
+)
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 0.216 sec. Processed 100.06 million rows, 1.10 GB (462.68 million rows/s., 5.09 GB/s.)
+
+
+WITH
+    toDate('2021-12-03') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM metric
+WHERE (date > start_date) AND (date < end_date) AND key_a_cond
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 0.308 sec. Processed 162.09 million rows, 1.78 GB (526.89 million rows/s., 5.80 GB/s.)
+
+WITH
+    toDate('2021-12-03') AS start_date,
+    toDate('2022-02-15') AS end_date,
+    key_a IN (1, 3, 5, 7) AS key_a_cond
+SELECT
+    key_b,
+    sum(value) AS sum
+FROM
+(
+    SELECT
+        key_b,
+        value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST([toYYYYMM(start_date), toYYYYMM(end_date)], 'Array(String)')) AND (date > start_date) AND (date < end_date) AND key_a_cond
+    UNION ALL
+    SELECT
+        key_b,
+        sum(value) AS value
+    FROM metric
+    WHERE indexHint(_partition_id IN CAST(range(toYYYYMM(start_date) + 1, toYYYYMM(end_date)), 'Array(String)')) AND key_a_cond
+    GROUP BY key_b
+)
+GROUP BY key_b
+ORDER BY sum DESC
+LIMIT 25
+
+25 rows in set. Elapsed: 0.268 sec. Processed 102.08 million rows, 1.16 GB (381.46 million rows/s., 4.33 GB/s.)
+```