diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
index 83310233f0259..69f797da3a66f 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
@@ -86,7 +86,7 @@ def data_sources # :nodoc
             SELECT c.relname
             FROM pg_class c
             LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
-            WHERE c.relkind IN ('r', 'v','m') -- (r)elation/table, (v)iew, (m)aterialized view
+            WHERE c.relkind IN ('r','v','m') -- (r)elation/table, (v)iew, (m)aterialized view
             AND n.nspname = ANY (current_schemas(false))
           SQL
         end
@@ -108,13 +108,13 @@ def data_source_exists?(name)
           name = Utils.extract_schema_qualified_name(name.to_s)
           return false unless name.identifier
 
-          select_value(<<-SQL, "SCHEMA").to_i > 0
-              SELECT COUNT(*)
+          select_values(<<-SQL, "SCHEMA").any?
+              SELECT c.relname
               FROM pg_class c
               LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
               WHERE c.relkind IN ('r','v','m') -- (r)elation/table, (v)iew, (m)aterialized view
-              AND c.relname = '#{name.identifier}'
-              AND n.nspname = #{name.schema ? "'#{name.schema}'" : 'ANY (current_schemas(false))'}
+              AND c.relname = #{quote(name.identifier)}
+              AND n.nspname = #{name.schema ? quote(name.schema) : "ANY (current_schemas(false))"}
           SQL
         end
 
@@ -137,8 +137,8 @@ def view_exists?(view_name) # :nodoc:
             FROM pg_class c
             LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
             WHERE c.relkind IN ('v','m') -- (v)iew, (m)aterialized view
-            AND c.relname = '#{name.identifier}'
-            AND n.nspname = #{name.schema ? "'#{name.schema}'" : 'ANY (current_schemas(false))'}
+            AND c.relname = #{quote(name.identifier)}
+            AND n.nspname = #{name.schema ? quote(name.schema) : "ANY (current_schemas(false))"}
           SQL
         end
 
@@ -441,7 +441,7 @@ def primary_keys(table_name) # :nodoc:
             WITH pk_constraint AS (
               SELECT conrelid, unnest(conkey) AS connum FROM pg_constraint
               WHERE contype = 'p'
-                AND conrelid = '#{quote_table_name(table_name)}'::regclass
+                AND conrelid = #{quote(quote_table_name(table_name))}::regclass
             ), cons AS (
               SELECT conrelid, connum, row_number() OVER() AS rownum FROM pk_constraint
             )
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index a33e64883ee05..acd1eeace76d4 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -750,7 +750,7 @@ def column_definitions(table_name) # :nodoc:
                      col_description(a.attrelid, a.attnum) AS comment
                 FROM pg_attribute a LEFT JOIN pg_attrdef d
                   ON a.attrelid = d.adrelid AND a.attnum = d.adnum
-               WHERE a.attrelid = '#{quote_table_name(table_name)}'::regclass
+               WHERE a.attrelid = #{quote(quote_table_name(table_name))}::regclass
                  AND a.attnum > 0 AND NOT a.attisdropped
                ORDER BY a.attnum
           end_sql
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index e2b534b511dee..ebeac425d02b7 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -530,10 +530,12 @@ def translate_exception(exception, message)
 
         def table_structure_with_collation(table_name, basic_structure)
           collation_hash = {}
-          sql            = "SELECT sql FROM
-                              (SELECT * FROM sqlite_master UNION ALL
-                               SELECT * FROM sqlite_temp_master)
-                            WHERE type='table' and name='#{ table_name }' \;"
+          sql = <<-SQL
+            SELECT sql FROM
+              (SELECT * FROM sqlite_master UNION ALL
+               SELECT * FROM sqlite_temp_master)
+            WHERE type = 'table' AND name = #{quote(table_name)}
+          SQL
 
           # Result will have following sample string
           # CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
diff --git a/activerecord/test/cases/adapter_test.rb b/activerecord/test/cases/adapter_test.rb
index 8fa0645b0f68d..cfbc8ab9423f5 100644
--- a/activerecord/test/cases/adapter_test.rb
+++ b/activerecord/test/cases/adapter_test.rb
@@ -42,8 +42,10 @@ def test_tables
     def test_table_exists?
       ActiveSupport::Deprecation.silence do
         assert @connection.table_exists?("accounts")
-        assert !@connection.table_exists?("nonexistingtable")
-        assert !@connection.table_exists?(nil)
+        assert @connection.table_exists?(:accounts)
+        assert_not @connection.table_exists?("nonexistingtable")
+        assert_not @connection.table_exists?("'")
+        assert_not @connection.table_exists?(nil)
       end
     end
 
@@ -63,6 +65,7 @@ def test_data_source_exists?
       assert @connection.data_source_exists?("accounts")
       assert @connection.data_source_exists?(:accounts)
       assert_not @connection.data_source_exists?("nonexistingtable")
+      assert_not @connection.data_source_exists?("'")
       assert_not @connection.data_source_exists?(nil)
     end
 
diff --git a/activerecord/test/cases/view_test.rb b/activerecord/test/cases/view_test.rb
index 0e38cee334d4c..1f326d4b39845 100644
--- a/activerecord/test/cases/view_test.rb
+++ b/activerecord/test/cases/view_test.rb
@@ -11,20 +11,21 @@ module ViewBehavior
   end
 
   class Ebook < ActiveRecord::Base
+    self.table_name = "ebooks'"
     self.primary_key = "id"
   end
 
   def setup
     super
     @connection = ActiveRecord::Base.connection
-    create_view "ebooks", <<-SQL
+    create_view "ebooks'", <<-SQL
       SELECT id, name, status FROM books WHERE format = 'ebook'
     SQL
   end
 
   def teardown
     super
-    drop_view "ebooks"
+    drop_view "ebooks'"
   end
 
   def test_reading
@@ -66,15 +67,20 @@ def test_attributes
 
   def test_does_not_assume_id_column_as_primary_key
     model = Class.new(ActiveRecord::Base) do
-      self.table_name = "ebooks"
+      self.table_name = "ebooks'"
     end
     assert_nil model.primary_key
   end
 
   def test_does_not_dump_view_as_table
-    schema = dump_table_schema "ebooks"
-    assert_no_match %r{create_table "ebooks"}, schema
+    schema = dump_table_schema "ebooks'"
+    assert_no_match %r{create_table "ebooks'"}, schema
   end
+
+  private
+    def quote_table_name(name)
+      @connection.quote_table_name(name)
+    end
 end
 
 if ActiveRecord::Base.connection.supports_views?
@@ -83,11 +89,11 @@ class ViewWithPrimaryKeyTest < ActiveRecord::TestCase
 
     private
       def create_view(name, query)
-        @connection.execute "CREATE VIEW #{name} AS #{query}"
+        @connection.execute "CREATE VIEW #{quote_table_name(name)} AS #{query}"
       end
 
       def drop_view(name)
-        @connection.execute "DROP VIEW #{name}" if @connection.view_exists? name
+        @connection.execute "DROP VIEW #{quote_table_name(name)}" if @connection.view_exists? name
       end
   end
 
@@ -206,11 +212,11 @@ class MaterializedViewTest < ActiveRecord::PostgreSQLTestCase
 
     private
       def create_view(name, query)
-        @connection.execute "CREATE MATERIALIZED VIEW #{name} AS #{query}"
+        @connection.execute "CREATE MATERIALIZED VIEW #{quote_table_name(name)} AS #{query}"
       end
 
       def drop_view(name)
-        @connection.execute "DROP MATERIALIZED VIEW #{name}" if @connection.view_exists? name
+        @connection.execute "DROP MATERIALIZED VIEW #{quote_table_name(name)}" if @connection.view_exists? name
       end
   end
 end