update

PostgreSQL/common.sql

@@ -1,7 +1,5 @@
--- 修改用户的密码
+-- search_path
-alter user postgres with password '123456';
+SHOW search_path;
--- 查询所有用户
-select * from pg_catalog.pg_user;
 
 -- 查询表的 COLLATION VERSION
 SELECT

PostgreSQL/function.sql

@@ -0,0 +1,6 @@
+-- ROW 关键字生成一个元组
+SELECT ROW (1, 2, 3);
+
+-- pg_column_size函数获取存储数据需要的字节数
+SELECT pg_column_size(ROW (1,2,3)); -- 36
+SELECT pg_column_size(ROW (1::int2, 2::int2, 3::int2)); -- 30

PostgreSQL/user.sql

@@ -0,0 +1,4 @@
+-- 修改用户的密码
+alter user postgres with password '123456';
+-- 查询所有用户
+select * from pg_catalog.pg_user;