diff --git a/lastleg-service/src/main/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadSql.java b/lastleg-service/src/main/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadSql.java
index 05ac48fb3..773bbbf8e 100644
--- a/lastleg-service/src/main/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadSql.java
+++ b/lastleg-service/src/main/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadSql.java
@@ -35,10 +35,9 @@ public final class AnalyticsReadSql {
         String localEvidence="CONVERT_TZ(evidence_at_utc,'+00:00','+08:00')";
         String observedStart="CONVERT_TZ(GREATEST(evidence_at_utc,#{p.coveredFrom}),'+00:00','+08:00')";
         String observedEnd="CONVERT_TZ(#{p.coveredUntil},'+00:00','+08:00')";
-        // Candidate identity is already unique. DISTINCT preserves that identity while
-        // preventing MySQL from merging these per-SKU date calculations into every fact row.
-        String boundaryProjection="SUMMARY".equals(kind)?"SELECT DISTINCT evidence.*,":"SELECT evidence.*,";
-        String sql=candidates("SUMMARY".equals(kind))+" bounds AS ("+boundaryProjection
+        // Candidate identity is already unique; SUMMARY materializes bounds with NO_MERGE
+        // at its consumer, avoiding a redundant DISTINCT temporary table.
+        String sql=candidates("SUMMARY".equals(kind))+" bounds AS (SELECT evidence.*,"
             +"CASE WHEN evidence_at_utc IS NOT NULL AND #{p.completeFrom} IS NOT NULL AND #{p.completeUntil} IS NOT NULL THEN "
             +"GREATEST(#{p.from},#{p.completeFrom},TIMESTAMPADD(DAY,CASE WHEN CAST("+localEvidence+" AS TIME)='00:00:00' THEN 0 ELSE 1 END,DATE("+localEvidence+"))) END full_start,"
             +"LEAST(#{p.until},#{p.completeUntil},#{p.anchor}) full_end,"
@@ -62,7 +61,7 @@ public final class AnalyticsReadSql {
             +"FROM ll_selfop_sku_daily_sales WHERE sales_run_id=#{p.salesRun} AND"+KEY_FILTER
             +" AND business_date>=TIMESTAMPADD(DAY,-30,#{p.anchor}) AND business_date<TIMESTAMPADD(DAY,1,#{p.anchor}) "
             +"GROUP BY customer_code,sku_code),"
-            +" counted AS (SELECT b.*,r.observed_sum,r.order_sum,"
+            +" counted AS (SELECT "+("SUMMARY".equals(kind)?"/*+ NO_MERGE(b) */ ":"")+"b.*,r.observed_sum,r.order_sum,"
             +"CASE WHEN b.profile_unit_valid=1 AND (r.min_unit IS NULL OR (r.min_unit=b.quantity_unit AND r.max_unit=b.quantity_unit)) "
             +"AND (m.min_unit IS NULL OR (m.min_unit=b.quantity_unit AND m.max_unit=b.quantity_unit)) THEN 1 ELSE 0 END unit_valid,"
             +"CASE WHEN #{p.formalSales}=1 THEN GREATEST(0,COALESCE(TIMESTAMPDIFF(DAY,b.full_start,b.full_end),0)) "
diff --git a/lastleg-service/src/test/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadMapperTest.java b/lastleg-service/src/test/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadMapperTest.java
index 08880d127..f4cd0836a 100644
--- a/lastleg-service/src/test/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadMapperTest.java
+++ b/lastleg-service/src/test/java/com/baiyue/lastleg/selfoperated/analytics/query/AnalyticsReadMapperTest.java
@@ -60,7 +60,8 @@ class AnalyticsReadMapperTest {
         assertTrue(page.contains("GROUP BY d.customer_code,d.sku_code")); assertFalse(page.contains("business_date>=DATE_SUB"));
         assertFalse(page.contains("ll_selfop_inventory_snapshot"));
         assertFalse(page.contains("metric_sales"));assertFalse(page.contains("FROM bounds WHERE 1=0"));
-        assertTrue(page.contains("bounds AS (SELECT DISTINCT evidence.*,"));
+        assertTrue(page.contains("bounds AS (SELECT evidence.*,"));
+        assertTrue(page.contains("counted AS (SELECT /*+ NO_MERGE(b) */ b.*,"));
         assertTrue(page.endsWith("ORDER BY observed_quantity IS NULL,observed_quantity DESC,sku_code ASC,customer_code ASC LIMIT ? OFFSET ?"));
         assertTrue(page.indexOf("GROUP BY d.customer_code,d.sku_code")<page.lastIndexOf("LIMIT"));
         assertFalse(page.contains("FROM bounds b JOIN ll_selfop_sku_daily_sales"));