fix(guide): simplify directory structure

guide/english/sql/sql-insert-into-select-statement/index.md

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+---
+title: SQL Insert into Select Statement
+---
+## SQL Insert into Select Statement
+
+You can insert records in a table using data that are already stored in the database. This is only a copy of data and it doesn’t affect the origin table. 
+
+The `INSERT INTO SELECT` statement combines `INSERT INTO` and `SELECT` statements and you can use any conditions you want. The syntax is:
+
+```sql
+INSERT INTO table2 (column1, column2, column3, ...)
+SELECT column1, column2, column3, ...
+FROM table1
+WHERE condition;
+```
+
+Here is an example that inserts in the table Person all the male students from the table Students.
+
+```sql
+INSERT INTO Person(Id, Name, DateOfBirth, Gender)
+SELECT Id, Name, DateOfBirth, Gender
+FROM Students
+WHERE Gender = ‘M’
+```
+
+
+