update query

dal/db_query/queries.sql

@@ -317,4 +317,71 @@ FROM answer a
 WHERE a.id = ANY($1::bigint[]) AND a.deleted = FALSE AND q.accountid = $2 AND a.start = false;
 
 -- name: CheckResultOwner :one
-SELECT q.accountid FROM answer a JOIN quiz q ON a.quiz_id = q.id WHERE a.id = $1 AND a.deleted = FALSE AND a.start = false;
+SELECT q.accountid FROM answer a JOIN quiz q ON a.quiz_id = q.id WHERE a.id = $1 AND a.deleted = FALSE AND a.start = false;
+
+-- name:DeviceStats :many
+WITH DeviceStats AS (
+    SELECT
+        device_type,
+        COUNT(*) AS device_count
+    FROM
+        answer
+    WHERE
+        quiz_id = $1
+      AND created_at >= to_timestamp($2)
+      AND created_at <= to_timestamp($3)
+      AND result = TRUE
+    GROUP BY
+        device_type
+),
+     OSStats AS (
+         SELECT
+             os,
+             COUNT(*) AS os_count
+         FROM
+             answer
+         WHERE
+             quiz_id = $1
+           AND created_at >= to_timestamp($2)
+           AND created_at <= to_timestamp($3)
+           AND result = TRUE
+         GROUP BY
+             os
+     ),
+     BrowserStats AS (
+         SELECT
+             browser,
+             COUNT(*) AS browser_count
+         FROM
+             answer
+         WHERE
+             quiz_id = $1
+           AND created_at >= to_timestamp($2)
+           AND created_at <= to_timestamp($3)
+           AND result = TRUE
+         GROUP BY
+             browser
+     ),
+     TotalStats AS (
+         SELECT
+             COUNT(*) AS total_count
+         FROM
+             answer
+         WHERE
+             quiz_id = $1
+           AND created_at >= to_timestamp($2)
+           AND created_at <= to_timestamp($3)
+           AND result = TRUE
+     )
+SELECT
+    device_type,
+    (device_count::FLOAT / total_count) * 100 AS device_percentage,
+    os,
+    (os_count::FLOAT / total_count) * 100 AS os_percentage,
+    browser,
+    (browser_count::FLOAT / total_count) * 100 AS browser_percentage
+FROM
+    DeviceStats,
+    OSStats,
+    BrowserStats,
+    TotalStats;

repository/statistics/statistics.go

@@ -1,6 +1,7 @@
 package statistics
 
 import (
+	"context"
 	"database/sql"
 	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/dal/sqlcgen"
 )
@@ -21,3 +22,23 @@ func NewStatisticsRepo(deps Deps) *StatisticsRepository {
 		pool:    deps.Pool,
 	}
 }
+
+type DeviceStatReq struct {
+	QuizId string
+	From   uint64
+	To     uint64
+}
+
+type DeviceStatResp struct {
+	Device  map[string]float64
+	OS      map[string]float64
+	Browser map[string]float64
+}
+
+func (r *StatisticsRepository) GetDeviceStatistics(ctx context.Context, req DeviceStatReq) DeviceStatResp {
+	resp := DeviceStatResp{
+		Device:  make(map[string]float64),
+		OS:      make(map[string]float64),
+		Browser: make(map[string]float64),
+	}
+}