Add one-skill

one-skill/smart-data-developer/references/sql/templates/kudu/query-template.sql

@@ -0,0 +1,179 @@
+-- =====================================================================
+-- @Name:             KUDU-D-SQL-{表名}-QUERY
+-- @Version:          1.0
+-- @Desc:             Kudu (via Impala) 查询模板
+-- @TargetDatabase:   Apache Kudu (via Impala)
+-- =====================================================================
+
+-- ============================================================================
+-- 1. 单表查询
+-- ============================================================================
+
+SELECT 
+    id,
+    name,
+    amount,
+    created_at
+FROM db_name.kudu_table
+WHERE stat_date = '${day_id}'
+  AND status = 'active'
+ORDER BY created_at DESC
+LIMIT 1000;
+
+-- ============================================================================
+-- 2. JOIN 查询
+-- ============================================================================
+
+-- 两表 JOIN（Kudu 表 JOIN 非 Kudu 表也支持）
+SELECT 
+    k.id,
+    k.name,
+    k.amount,
+    d.dept_name
+FROM db_name.kudu_table k
+JOIN db_name.dim_department d ON k.dept_id = d.dept_id
+WHERE k.stat_date = '${day_id}';
+
+-- 多表 JOIN
+SELECT 
+    k.id,
+    k.user_name,
+    p.product_name,
+    k.quantity,
+    k.total_amount
+FROM db_name.kudu_orders k
+JOIN db_name.dim_users u ON k.user_id = u.user_id
+JOIN db_name.dim_products p ON k.product_id = p.product_id
+WHERE k.stat_date BETWEEN '${start_date}' AND '${end_date}';
+
+-- ============================================================================
+-- 3. 聚合查询
+-- ============================================================================
+
+SELECT 
+    department,
+    COUNT(*) AS record_count,
+    SUM(amount) AS total_amount,
+    AVG(amount) AS avg_amount,
+    MAX(amount) AS max_amount,
+    MIN(amount) AS min_amount
+FROM db_name.kudu_table
+WHERE stat_date = '${day_id}'
+GROUP BY department
+HAVING COUNT(*) >= 5
+ORDER BY total_amount DESC;
+
+-- 多字段分组 + 去重计数
+SELECT 
+    stat_date,
+    region,
+    COUNT(*) AS order_count,
+    COUNT(DISTINCT user_id) AS unique_users,
+    SUM(amount) AS total_amount
+FROM db_name.kudu_table
+WHERE stat_date BETWEEN '${start_date}' AND '${end_date}'
+GROUP BY stat_date, region;
+
+-- ============================================================================
+-- 4. 窗口函数
+-- ============================================================================
+
+-- ROW_NUMBER（分组取Top N）
+SELECT *
+FROM (
+    SELECT 
+        department,
+        user_name,
+        amount,
+        ROW_NUMBER() OVER (PARTITION BY department ORDER BY amount DESC) AS rn
+    FROM db_name.kudu_table
+    WHERE stat_date = '${day_id}'
+) t
+WHERE rn <= 3;
+
+-- 累计聚合
+SELECT 
+    stat_date,
+    daily_amount,
+    SUM(daily_amount) OVER (ORDER BY stat_date) AS cumulative_amount
+FROM (
+    SELECT stat_date, SUM(amount) AS daily_amount
+    FROM db_name.kudu_table
+    GROUP BY stat_date
+) t;
+
+-- LAG/LEAD（环比）
+SELECT 
+    stat_date,
+    daily_amount,
+    LAG(daily_amount, 1) OVER (ORDER BY stat_date) AS prev_amount,
+    daily_amount - LAG(daily_amount, 1) OVER (ORDER BY stat_date) AS daily_change
+FROM (
+    SELECT stat_date, SUM(amount) AS daily_amount
+    FROM db_name.kudu_table
+    GROUP BY stat_date
+) t;
+
+-- ============================================================================
+-- 5. 子查询
+-- ============================================================================
+
+-- IN 子查询
+SELECT *
+FROM db_name.kudu_table
+WHERE user_id IN (
+    SELECT user_id FROM db_name.vip_users WHERE vip_level >= 3
+)
+AND stat_date = '${day_id}';
+
+-- EXISTS 子查询
+SELECT *
+FROM db_name.kudu_products p
+WHERE EXISTS (
+    SELECT 1 FROM db_name.kudu_inventory i 
+    WHERE i.product_id = p.product_id 
+      AND i.quantity > 0
+);
+
+-- ============================================================================
+-- 6. 条件聚合（CASE WHEN + 聚合）
+-- ============================================================================
+
+SELECT 
+    stat_date,
+    COUNT(*) AS total_count,
+    SUM(CASE WHEN status = 'completed' THEN 1 ELSE 0 END) AS completed_count,
+    SUM(CASE WHEN status = 'cancelled' THEN 1 ELSE 0 END) AS cancelled_count,
+    SUM(CASE WHEN amount > 1000 THEN amount ELSE 0 END) AS high_value_amount
+FROM db_name.kudu_table
+WHERE stat_date = '${day_id}'
+GROUP BY stat_date;
+
+-- ============================================================================
+-- 7. LIMIT / OFFSET（分页）
+-- ============================================================================
+
+SELECT id, name, amount
+FROM db_name.kudu_table
+WHERE stat_date = '${day_id}'
+ORDER BY id
+LIMIT 20 OFFSET 0;
+
+-- ============================================================================
+-- 8. Kudu 特有：通过主键高效点查
+-- ============================================================================
+-- Kudu 主键查询可跳过扫描，直接定位 tablet
+
+-- 单主键点查
+SELECT * FROM db_name.kudu_table
+WHERE id = 12345;
+
+-- 复合主键点查
+SELECT * FROM db_name.kudu_composite_pk
+WHERE user_id = 1001
+  AND order_date = '2026-05-01'
+  AND order_seq = 1;
+
+-- 主键 IN 查询
+SELECT * FROM db_name.kudu_table
+WHERE id IN (1001, 1002, 1003, 1004, 1005);