0415编写多表操作文档

sql/04.multitable.md

@@ -19,9 +19,9 @@ insert into table2 select 3, 70
 
 ```
 	table1					|			table2
-------------------------------------------------------
+-----------------------------------------------------------------------------------------
 	id		name			|			id		score
-	1		lee				|			1		90
+	1		lee			|			1		90
 	2		zhang			|			2		100
 	4		wang			|			3		70
 ```
@@ -44,8 +44,8 @@ select * from table1 inner join table2 on table1.id = table2.id
 
 ```
 	id		name		id		score
-----------------------------------------
-	1		lee			1		90
+-----------------------------------------------------------------------------------------
+	1		lee		1		90
 	2		zhang		2		100
 ```
 
@@ -80,8 +80,8 @@ select * from table1 left join table2 on table1.id = table2.id
 
 ```
 	id		name		id		score
-------------------------------------------
-	1		lee			1		90
+-----------------------------------------------------------------------------------------
+	1		lee		1		90
 	2		zhang		2		100
 	4		wang		NULL	NULL
 ```
@@ -102,10 +102,10 @@ select * from table1 right join table2 on table1.id = table2.id
 
 ```
 	id		name		id		score
-------------------------------------------
-	1		lee			1		90
+-----------------------------------------------------------------------------------------
+	1		lee		1		90
 	2		zhang		2		100
-	NULL	NULL		3		70
+	NULL		NULL		3		70
 ```
 
 [^注释]: 包含 table2 的所有子句，根据指定条件返回 table1 相应的字段，不符合的以 null 显示
@@ -124,11 +124,11 @@ select * from table1 full join table2 on table1.id = table2.id
 
 ```
 	id		name		id		score
-------------------------------------------
-	1		lee			1		90
+-----------------------------------------------------------------------------------------
+	1		lee		1		90
 	2		zhang		2		100
 	4		wang		NULL	NULL
-	NULL	NULL		3		70
+	NULL		NULL		3		70
 ```
 
 [^注释]: 返回左右连接的和（见上左、右连接）
@@ -149,14 +149,14 @@ select * from table1 cross join table2
 
 ```
 	id		name		id		score
-------------------------------------------
-	1		lee			1		90
+-----------------------------------------------------------------------------------------
+	1		lee		1		90
 	2		zhang		1		90
 	4		wang		1		90
-	1		lee			2		100
+	1		lee		2		100
 	2		zhang		2		100
 	4		wang		2		100
-	1		lee			3		70
+	1		lee		3		70
 	2		zhang		3		70
 	4		wang		3		70
 ```
@@ -185,7 +185,7 @@ insert into table3 select 3, null
 
 ```
 	table3
----------------------
+-----------------------------------------------------------------------------------------
 	id		score
 	1		null
 	2		null
@@ -202,7 +202,7 @@ update b set b.score = a.score from table2 a, table3 b where a.id = b.id
 
 ```
 	table3
----------------------
+-----------------------------------------------------------------------------------------
 	id		score
 	1		90
 	2		100
@@ -221,9 +221,9 @@ delete from table1 where not exists(select 1 from table2 b where table1.id = b.i
 
 ```
 	table1					|			table2
-------------------------------------------------------
+-----------------------------------------------------------------------------------------
 	id		name			|			id		score
-	1		lee				|			1		90
+	1		lee			|			1		90
 	2		zhang			|			2		100
 	4		wang			|			3		70
 ```
@@ -232,11 +232,11 @@ delete from table1 where not exists(select 1 from table2 b where table1.id = b.i
 
 ```
 	table1					|			table2
-------------------------------------------------------
+-----------------------------------------------------------------------------------------
 	id		name			|			id		score
-	1		lee				|			1		90
+	1		lee			|			1		90
 	2		zhang			|			2		100
-							|			3		70
+						|			3		70
 ```
 
 [^注释]: 将 table2 表中未使用的 table1 表编号删除
@@ -253,11 +253,11 @@ delete from table1 where exists(select 1 from table2 b where table1.id = b.id)
 
 ```
 	table1					|			table2
-------------------------------------------------------
+-----------------------------------------------------------------------------------------
 	id		name			|			id		score
 	4		wang			|			1		90
-							|			2		100
-							|			3		70
+						|			2		100
+						|			3		70
 ```
 
 [^注释]: 将 table2 表中使用的 table1 表编号删除