fix(guide): simplify directory structure

guide/english/sql/sql-update-statement/index.md

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+---
+title: SQL Update Statement
+---
+## SQL Update Statement
+
+To update a record in a table you use the `UPDATE` statement. 
+
+Be careful. You can update all records of the table or just a few. Use the `WHERE` condition to specify which records do you want to update. It is possible to update one or more columns at a time. The syntax is:
+
+```sql
+UPDATE table_name
+SET column1 = value1, 
+    column2 = value2, ...
+WHERE condition;
+```
+
+Here is an example updating the Name of the record with Id 4:
+
+```sql
+UPDATE Person
+SET Name = “Elton John”
+WHERE Id = 4;
+```
+
+You can also update columns in a table by using values from other tables. Use `JOIN` clause to get data from multiple tables. The syntax is:
+
+```sql
+UPDATE table_name1
+SET table_name1.column1 = table_name2.columnA
+    table_name1.column2 = table_name2.columnB
+FROM table_name1
+JOIN table_name2 ON table_name1.ForeignKey = table_name2.Key
+```
+
+Here is an example updating Manager of all records:
+
+```sql
+UPDATE Person
+SET Person.Manager = Department.Manager
+FROM Person
+JOIN Department ON Person.DepartmentID = Department.ID
+```