From e00cc59eed9ef271a160565dd7ff990a4a548e6f Mon Sep 17 00:00:00 2001
From: wkc <978997012@qq.com>
Date: Fri, 6 Feb 2026 09:21:12 +0800
Subject: [PATCH] =?UTF-8?q?docs:=20=E8=AE=B0=E5=BD=95=E5=91=98=E5=B7=A5?=
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---
 sql/update_ccdi_employee_20260206.sql | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 sql/update_ccdi_employee_20260206.sql

diff --git a/sql/update_ccdi_employee_20260206.sql b/sql/update_ccdi_employee_20260206.sql
new file mode 100644
index 0000000..69c74e3
--- /dev/null
+++ b/sql/update_ccdi_employee_20260206.sql
@@ -0,0 +1,15 @@
+-- 员工信息表柜员号唯一性说明
+-- 日期: 2026-02-06
+-- 目的: 支持批量更新时使用ON DUPLICATE KEY UPDATE语法
+
+-- 说明:
+-- ccdi_employee表的employee_id字段已经是PRIMARY KEY(主键)
+-- 主键本身具有UNIQUE约束,因此employee_id已经是唯一的
+-- 不需要再添加额外的UNIQUE KEY约束
+
+-- 验证主键约束:
+-- SHOW INDEX FROM ccdi_employee WHERE Key_name = 'PRIMARY';
+-- 结果显示: employee_id是主键,Non_unique=0表示唯一
+
+-- 结论:
+-- employee_id字段已满足UNIQUE约束要求,可以直接用于ON DUPLICATE KEY UPDATE语法