diff --git a/scripts/create_table.sql b/scripts/create_table.sql
index b5aa279..4e633ff 100644
--- a/scripts/create_table.sql
+++ b/scripts/create_table.sql
@@ -1,7 +1,7 @@
 -- 账户表
 CREATE TABLE account (
-  a_id SERIAL PRIMARY KEY,
-  meta JSONB
+  a_id SERIAL PRIMARY KEY, --账户号
+  meta JSONB			-- 元数据
 );
 -- {"name":"name",
 --  "balance": 0.00,
@@ -13,8 +13,8 @@ CREATE TABLE account (
 
 -- 类别表
 CREATE TABLE category (
-  c_id SERIAL PRIMARY KEY,
-  meta JSONB
+  c_id SERIAL PRIMARY KEY, -- 类别号
+  meta JSONB			-- 元数据
 );
 -- {"name":"name",
 --	"type":"in"/"out",
@@ -26,13 +26,14 @@ CREATE TABLE category (
 
 -- 流水表
 CREATE TABLE transaction (
-  t_id SERIAL PRIMARY KEY,
-  c_id INTEGER REFERENCES category(c_id),
-  a_id INTEGER REFERENCES account(a_id),
-  meta JSONB
+  t_id SERIAL PRIMARY KEY,  -- 流水号
+  c_id INTEGER REFERENCES category(c_id), -- 关联账户号
+  a_id INTEGER REFERENCES account(a_id),  -- 关联类别号
+  meta JSONB -- 元数据
 );
 -- {"discription":"something",(可选)
 --	"type":"in"/"out"/"transfer",
+
 --  "transfer_dist":a_id,(可选）
 --  "reimburse":{  （报销）
 --  "finish": true,
@@ -40,4 +41,14 @@ CREATE TABLE transaction (
 --	}
 --	"":"something"}
 
+-- 转账表 记录转账信息
+CREATE TABLE account_transaction(
+	at_id SERIAL PRIMARY KEY, -- 转账号
+	src INTEGER REFERENCES category(c_id), -- 源账户号
+	dst INTEGER REFERENCES category(c_id), -- 目的账户号
+	meta JSONB -- 元数据
+);
+
+
+
 
diff --git a/scripts/drop_table.sql b/scripts/drop_table.sql
new file mode 100644
index 0000000..92d280d
--- /dev/null
+++ b/scripts/drop_table.sql
@@ -0,0 +1,5 @@
+DROP TABLE transaction;
+DROP TABLE account_transaction;
+DROP TABLE category;
+DROP TABLE account;
+