Merge pull request #1176 from yangj1211/apply

add doc of apply

docs/MatrixOne/Reference/SQL-Reference/Data-Query-Language/apply/cross-apply.md

@@ -0,0 +1,33 @@
+# **CROSS APPLY**
+
+## **语法说明**
+
+`CROSS APPLY` 是 MatrixOne 中的一个特殊连接操作符，主要用于将一个表的每一行与另一个返回结果集的表函数（如表值函数）进行连接。与 JOIN 不同，CROSS APPLY 允许右侧的子查询或表值函数依赖于左侧表的每一行，从而为每一行返回不同的结果。
+
+## **语法结构**
+
+```
+> SELECT <columns>
+FROM <table_name>
+CROSS APPLY <table_function> <alias>;
+```
+
+## **示例**
+
+```sql
+mysql> create table t1(a int, b int);
+Query OK, 0 rows affected (0.03 sec)
+
+mysql> insert into t1 values(1,3),(1,-1);
+Query OK, 2 rows affected (0.00 sec)
+
+mysql> select * from t1 cross apply generate_series(t1.a,t1.b,1)g;
++------+------+--------+
+| a    | b    | result |
++------+------+--------+
+|    1 |    3 |      1 |
+|    1 |    3 |      2 |
+|    1 |    3 |      3 |
++------+------+--------+
+3 rows in set (0.02 sec)
+```

docs/MatrixOne/Reference/SQL-Reference/Data-Query-Language/apply/outer-apply.md

@@ -0,0 +1,34 @@
+# **OUTER APPLY**
+
+## **语法说明**
+
+`OUTER APPLY` 是用来将主表的每一行与一个函数或子查询的结果动态关联的。（右侧内容可以基于主表的行动态生成）。与 [`CROSS APPLY`](./cross-apply.md) 不同的是，即使右侧没有数据，也不会丢弃主表的记录，只是右侧列用 NULL 填充。（类似 LEFT JOIN 的效果，但右侧是动态生成的数据）。
+
+## **语法结构**
+
+```
+> SELECT <columns>
+FROM <table_name>
+outer APPLY <table_function><alias>;
+```
+
+## **示例**
+
+```sql
+mysql> create table t1(a int, b int);
+Query OK, 0 rows affected (0.03 sec)
+
+mysql> insert into t1 values(1,3),(1,-1);
+Query OK, 2 rows affected (0.00 sec)
+
+mysql> select * from t1 outer apply generate_series(t1.a,t1.b,1)g;
++------+------+--------+
+| a    | b    | result |
++------+------+--------+
+|    1 |    3 |      1 |
+|    1 |    3 |      2 |
+|    1 |    3 |      3 |
+|    1 |   -1 |   NULL |
++------+------+--------+
+4 rows in set (0.01 sec)
+```

docs/MatrixOne/Reference/SQL-Reference/SQL-Type.md

@@ -106,6 +106,11 @@
 - [OUTER JOIN](Data-Query-Language/join/outer-join.md)
 - [NATURAL JOIN](Data-Query-Language/join/natural-join.md)
 
+### 应用查询（Apply Query），将某个操作应用于每一行数据的查询方式
+
+- [CROSS APPLY](Data-Query-Language/apply/cross-apply.md)
+- [OUTER APPLY](Data-Query-Language/apply/outer-apply.md)
+
 ### 公用表达式（Common Table Expressions），将某些查询作为是临时结果，可以在其他 SQL 中引用，如 SELECT, INSERT, UPDATE 和 DELETE，其仅存在于查询执行期间
 
 - [With CTE](Data-Query-Language/with-cte.md)

mkdocs.yml

@@ -384,15 +384,9 @@ nav:
             - LAST_QUERY_ID(): MatrixOne/Reference/SQL-Reference/Data-Manipulation-Language/information-functions/last-query-id.md
             - LAST_INSERT_ID(): MatrixOne/Reference/SQL-Reference/Data-Manipulation-Language/information-functions/last-insert-id.md
         - 数据查询语言（DQL）:
-          - SELECT: MatrixOne/Reference/SQL-Reference/Data-Query-Language/select.md
-          - SUBQUERY:
-            - SUBQUERY 概述: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery.md
-            - Derived Tables: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/derived-tables.md
-            - 子查询与比较操作符的使用: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/comparisons-using-subqueries.md
-            - SUBQUERY with ANY or SOME: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-any-some.md
-            - SUBQUERY with ALL: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-all.md
-            - SUBQUERY with EXISTS: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-exists.md
-            - SUBQUERY with IN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-in.md
+          - APPLY:
+            - CROSS APPLY: MatrixOne/Reference/SQL-Reference/Data-Query-Language/apply/cross-apply.md
+            - OUTER APPLY: MatrixOne/Reference/SQL-Reference/Data-Query-Language/apply/outer-apply.md
           - JOIN:
             - JOIN 概述: MatrixOne/Reference/SQL-Reference/Data-Query-Language/join/join.md
             - CROSS JOIN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/join/cross-join.md
@@ -402,6 +396,15 @@ nav:
             - FULL JOIN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/join/full-join.md
             - OUTER JOIN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/join/outer-join.md
             - NATURAL JOIN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/join/natural-join.md
+          - SELECT: MatrixOne/Reference/SQL-Reference/Data-Query-Language/select.md
+          - SUBQUERY:
+            - SUBQUERY 概述: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery.md
+            - Derived Tables: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/derived-tables.md
+            - 子查询与比较操作符的使用: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/comparisons-using-subqueries.md
+            - SUBQUERY with ANY or SOME: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-any-some.md
+            - SUBQUERY with ALL: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-all.md
+            - SUBQUERY with EXISTS: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-exists.md
+            - SUBQUERY with IN: MatrixOne/Reference/SQL-Reference/Data-Query-Language/subqueries/subquery-with-in.md
           - With CTE: MatrixOne/Reference/SQL-Reference/Data-Query-Language/with-cte.md
           - 联合查询:
             - 联合查询概述: MatrixOne/Reference/SQL-Reference/Data-Query-Language/union-intersect-minus-overview.md