t-sql hacks that shouldn't break mainline behavior

macros/schema_tests/at_least_one.sql

@@ -5,8 +5,9 @@
 select count(*)
 from (
     select
-
-      count({{ column_name }})
+        {# subquery aggregate columns need aliases #}
+        {# thus: 'unique_values' #}
+      count({{ column_name }}) as unique_values
 
     from {{ model }}
 

macros/schema_tests/cardinality_equality.sql

@@ -1,5 +1,6 @@
 {% macro test_cardinality_equality(model, to, field) %}
-
+{# T-SQL doesn't let you use numbers as aliases for columns #}
+{# Thus, no "GROUP BY 1" #}
 {% set column_name = kwargs.get('column_name', kwargs.get('from')) %}
 
 
@@ -8,15 +9,15 @@ select
   {{ column_name }},
   count(*) as num_rows
 from {{ model }}
-group by 1
+group by {{ column_name }}
 ),
 
 table_b as (
 select
   {{ field }},
   count(*) as num_rows
 from {{ to }}
-group by 1
+group by {{ column_name }}
 ),
 
 except_a as (

macros/schema_tests/expression_is_true.sql

@@ -1,5 +1,6 @@
-{% macro test_expression_is_true(model, condition='true') %}
-
+{% macro test_expression_is_true(model, condition='1=1') %}
+{# T-SQL has no boolean data type so we use 1=1 which returns TRUE #}
+{# ref https://stackoverflow.com/a/7170753/3842610 #}
 {% set expression = kwargs.get('expression', kwargs.get('arg')) %}
 
 with meet_condition as (

macros/schema_tests/not_constant.sql

@@ -8,7 +8,7 @@ select count(*)
 from (
 
     select
-          count(distinct {{ column_name }})
+          count(distinct {{ column_name }}) as filler_column
 
     from {{ model }}
 

macros/schema_tests/relationships_where.sql

@@ -1,8 +1,8 @@
 {% macro test_relationships_where(model, to, field) %}
 
 {% set column_name = kwargs.get('column_name', kwargs.get('from')) %}
-{% set from_condition = kwargs.get('from_condition', "true") %}
-{% set to_condition = kwargs.get('to_condition', "true") %}
+{% set from_condition = kwargs.get('from_condition', "1=1") %}
+{% set to_condition = kwargs.get('to_condition', "1=1") %}
 
 with left_table as (