format

data/2.PostgreSQL中阶/2.服务端编程/1.聚合和分组/salary.md

@@ -30,25 +30,34 @@ from employee as l
 ### select 与 group by 不匹配
 
 ```postgresql
-select id, name, dept, max(salary) from employee group by dept;
+select id, name, dept, max(salary)
+from employee
+group by dept;
 ```
 
 ### group by 不对
 
 ```postgresql
-select id, name, dept, max(salary) from employee group by dept, id, name;
+select id, name, dept, max(salary)
+from employee
+group by dept, id, name;
 ```
 
 ### group by 不对
 
 ```postgresql
-select id, name, dept, max(salary) from employee group by dept, id, name having salary = max(salary);
+select id, name, dept, max(salary)
+from employee
+group by dept, id, name
+having salary = max(salary);
 ```
 
 ### 结构错误
 
-
 ```postgresql
-select id, name, dept, max(salary) from employee where salary=max(salary) group by dept;
+select id, name, dept, max(salary)
+from employee
+where salary = max(salary)
+group by dept;
 ```
 

data/2.PostgreSQL中阶/2.服务端编程/3.子查询/subquery.md

@@ -3,10 +3,11 @@
 现有员工表
 
 ```postgresql
-create table employee(
-    id serial primary key ,
-    name text,
-    dept text,
+create table employee
+(
+    id     serial primary key,
+    name   text,
+    dept   text,
     salary money
 )
 ```
@@ -16,9 +17,11 @@ create table employee(
 ## 答案
 
 ```postgresql
-select id, name, dept, salary 
+select id, name, dept, salary
 from employee
-where salary > (select max(salary) from employee where dept='sale')
+where salary > (select max(salary)
+                from employee
+                where dept = 'sale')
 ```
 
 ## 选项
@@ -26,27 +29,29 @@ where salary > (select max(salary) from employee where dept='sale')
 ### A
 
 ```postgresql
-select id, name, dept, salary 
+select id, name, dept, salary
 from employee
 where dept = 'sale'
-group by dept having salary > max(salary)
+group by dept
+having salary > max(salary)
 ```
 
 ### B
 
 ```postgresql
-select l.id, l.name, l.dept, l.salary 
-from employee as l join employee as r on l.salary > max(r.salary)
-where r.dept = 'sale' 
+select l.id, l.name, l.dept, l.salary
+from employee as l
+         join employee as r on l.salary > max(r.salary)
+where r.dept = 'sale'
 group by r.dept 
 ```
 
 ### C
 
 ```postgresql
-select id, name, dept, salary 
+select id, name, dept, salary
 from employee
-having salary > (select max(salary) from employee where dept='sale')
+having salary > (select max(salary) from employee where dept = 'sale')
 ```
 
 

data/2.PostgreSQL中阶/2.服务端编程/4.分页查询/paged.md

@@ -18,26 +18,36 @@ create table orders
 ## 答案
 
 ```postgresql
-select id, product_id, order_date, quantity, customer_id from orders where date = $1 offset $2 limit 100; 
+select id, product_id, order_date, quantity, customer_id
+from orders
+where date = $1
+offset $2 limit 100; 
 ```
 
 ## 选项
 
-### 缺少 limit 
+### 缺少 limit
 
 ```postgresql
-select id, product_id, order_date, quantity, customer_id from orders where date = $1 offset $2; 
+select id, product_id, order_date, quantity, customer_id
+from orders
+where date = $1
+offset $2; 
 ```
 
-
-###  缺少 offset
+### 缺少 offset
 
 ```postgresql
-select id, product_id, order_date, quantity, customer_id from orders where date = $1; 
+select id, product_id, order_date, quantity, customer_id
+from orders
+where date = $1; 
 ```
 
 ### 结构不对
 
 ```postgresql
-select id, product_id, order_date, quantity, customer_id from orders where date = $1 and offset $2 and limit 100 ; 
+select id, product_id, order_date, quantity, customer_id
+from orders
+where date = $1 and
+offset $2 and limit 100; 
 ```

data/2.PostgreSQL中阶/2.服务端编程/5.CTE/to_root.md

@@ -18,13 +18,14 @@ create table node
 ## 答案
 
 ```postgresql
-with recursive t(id, pid, content) as (select id, pid, content
-                                       from node
-                                       where id = $1
-                                       union all
-                                       select node.id, node.pid, node.level
-                                       from node
-                                                join t on node.id = t.pid)
+with recursive t(id, pid, content) as (
+    select id, pid, content
+    from node
+    where id = $1
+    union all
+    select node.id, node.pid, node.level
+    from node
+             join t on node.id = t.pid)
 select node.id, node.pid, content
 from node
          join t on node.id = t.id;
@@ -35,13 +36,14 @@ from node
 ### 没有递归定义
 
 ```postgresql
-with t as (select id, pid, content
-           from node
-           where id = $1
-           union all
-           select node.id, node.pid, node.level
-           from node
-                    join t on node.id = t.pid)
+with t as (
+    select id, pid, content
+    from node
+    where id = $1
+    union all
+    select node.id, node.pid, node.level
+    from node
+             join t on node.id = t.pid)
 select node.id, node.pid, content
 from node
          join t on node.id = t.id;
@@ -53,7 +55,7 @@ from node
 select node.id, node.pid, node.content
 from node
          join node as p on node.pid = p.id
-where id=$1;
+where id = $1;
 ```
 
 ### 子查询无法处理递归问题
@@ -61,5 +63,5 @@ where id=$1;
 ```postgresql
 select node.id, node.pid, node content
 from node as t
-where t.pid = (select id from t where id=t.pid)
+where t.pid = (select id from t where id = t.pid)
 ```
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/6.过程化编程/loop.md

@@ -5,11 +5,14 @@
 ## 答案
 
 ```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        return next idx;
-    end loop;
+create function gen(start integer, stop integer)
+    returns setof integer as
+$$
+begin
+    for idx in start .. stop
+        loop
+            return next idx;
+        end loop;
 end;
 $$ language plpgsql;
 ```
@@ -19,11 +22,13 @@ $$ language plpgsql;
 ### A
 
 ```postgresql
-create function gen(start integer, stop integer) returns integer as $$
-begin 
-    for idx in start .. stop loop
-        return idx;
-    end loop;
+create function gen(start integer, stop integer) returns integer as
+$$
+begin
+    for idx in start .. stop
+        loop
+            return idx;
+        end loop;
 end;
 $$ language plpgsql;
 ```
@@ -31,11 +36,14 @@ $$ language plpgsql;
 ### B
 
 ```postgresql
-create function gen(start integer, stop integer) returns integer as $$
-begin 
-    for idx in start .. stop loop
-        yield idx;
-    end loop;
+create function gen(start integer, stop integer)
+    returns integer as
+$$
+begin
+    for idx in start .. stop
+        loop
+            yield idx;
+        end loop;
 end;
 $$ language plpgsql;
 ```
@@ -43,12 +51,15 @@ $$ language plpgsql;
 ### C
 
 ```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        return idx;
-        idx += 1;
-    end loop;
+create function gen(start integer, stop integer)
+    returns setof integer as
+$$
+begin
+    for idx in start .. stop
+        loop
+            return idx;
+            idx += 1;
+        end loop;
 end;
 $$ language plpgsql;
 ```
@@ -56,11 +67,14 @@ $$ language plpgsql;
 ### D
 
 ```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        select idx;
-    end loop ;
+create function gen(start integer, stop integer)
+    returns setof integer as
+$$
+begin
+    for idx in start .. stop
+        loop
+            select idx;
+        end loop;
 end;
 $$ language plpgsql;
 ```
\ No newline at end of file