Drop all the objects in a schema

drop_all_objects_in_list_of_schemas.sql

-- SQL SERVER
-- change values inserted in @schema_list to the schemas you want to drop the objects from

SET NOCOUNT ON;

DECLARE
    @sql NVARCHAR(MAX);
SET @sql = '';

DECLARE
    @schema_list TABLE (
        schema_name NVARCHAR(100)
    );
INSERT INTO @schema_list
VALUES ('schema_1')
     , ('schema_2')

SELECT @sql +=
       'ALTER TABLE ' + QUOTENAME(SCHEMA_NAME(t.schema_id))
           + '.' + QUOTENAME(OBJECT_NAME(s.parent_object_id))
           + ' DROP CONSTRAINT ' + QUOTENAME(s.name) + ';'
  FROM sys.foreign_keys    s
           JOIN sys.tables t ON s.parent_object_id = t.object_id
           JOIN sys.tables t2 ON s.referenced_object_id = t2.object_id
 WHERE t2.schema_id IN ( SELECT SCHEMA_ID(schema_name) FROM @schema_list )

SELECT @sql +=
       'DROP ' +
       CASE
           WHEN type = 'SO' THEN 'SEQUENCE'
           WHEN type IN ('P', 'PC') THEN 'PROCEDURE'
           WHEN type = 'U' THEN 'TABLE'
           WHEN type IN ('IF', 'TF', 'FN') THEN 'FUNCTION'
           WHEN type = 'V' THEN 'VIEW'
           END +
       ' ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME(name) + ';'
  FROM sys.objects
 WHERE schema_id IN ( SELECT SCHEMA_ID(schema_name) FROM @schema_list )
   AND type IN ('SO', 'P', 'PC', 'U', 'IF', 'TF', 'FN', 'V')
 ORDER BY CASE
              WHEN type = 'SO' THEN 1
              WHEN type IN ('P', 'PC') THEN 5
              WHEN type = 'U' THEN 4
              WHEN type IN ('IF', 'TF', 'FN') THEN 2
              WHEN type = 'V' THEN 3
              END

SELECT @sql +=
       'DROP XML SCHEMA COLLECTION '
           + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME(name) + ';'
  FROM sys.xml_schema_collections
 WHERE schema_id IN ( SELECT SCHEMA_ID(schema_name) FROM @schema_list )

SELECT @sql +=
       'DROP SCHEMA ' + QUOTENAME(schema_name) + ';'
  FROM @schema_list;

EXEC sp_executesql @sql;