DBT - use DBT modeling to insert rows in a table like date dimension table in Azure Synapse - insert-update

Question

I need reference to inserting rows in a table using DBT models. Sample example that can be considered is a date dimension table, where we want to insert rows for next years.

Answer 1

dbt is built to handle the inserts for you since it generally works as a transformation layer on data already in your warehouse.
As an example of how to build a date dimension table, the gitlab data team have a public repo which includes an example of how to build that using the dbt-utils package macro for a date spine
The simplest version would just be:
date_dim.sql
WITH date_spine AS (
{{ dbt_utils.date_spine(
start_date="to_date('01/01/2000', 'mm/dd/yyyy')",
datepart="day",
end_date="to_date('12/01/2050', 'mm/dd/yyyy')"
)
}}
)
select * from date_spine
And the link to the gitlab example:
date_details_source.sql
WITH date_spine AS (
{{ dbt_utils.date_spine(
start_date="to_date('11/01/2009', 'mm/dd/yyyy')",
datepart="day",
end_date="dateadd(year, 40, current_date)"
)
}}
), calculated as (
SELECT
date_day,
date_day AS date_actual,
DAYNAME(date_day) AS day_name,
DATE_PART('month', date_day) AS month_actual,
DATE_PART('year', date_day) AS year_actual,
DATE_PART(quarter, date_day) AS quarter_actual,
DATE_PART(dayofweek, date_day) + 1 AS day_of_week,
CASE WHEN day_name = 'Sun' THEN date_day
ELSE DATEADD('day', -1, DATE_TRUNC('week', date_day)) END AS first_day_of_week,
CASE WHEN day_name = 'Sun' THEN WEEK(date_day) + 1
ELSE WEEK(date_day) END AS week_of_year_temp, --remove this column
CASE WHEN day_name = 'Sun' AND LEAD(week_of_year_temp) OVER (ORDER BY date_day) = '1'
THEN '1'
ELSE week_of_year_temp END AS week_of_year,
DATE_PART('day', date_day) AS day_of_month,
ROW_NUMBER() OVER (PARTITION BY year_actual, quarter_actual ORDER BY date_day) AS day_of_quarter,
ROW_NUMBER() OVER (PARTITION BY year_actual ORDER BY date_day) AS day_of_year,
CASE WHEN month_actual < 2
THEN year_actual
ELSE (year_actual+1) END AS fiscal_year,
CASE WHEN month_actual < 2 THEN '4'
WHEN month_actual < 5 THEN '1'
WHEN month_actual < 8 THEN '2'
WHEN month_actual < 11 THEN '3'
ELSE '4' END AS fiscal_quarter,
ROW_NUMBER() OVER (PARTITION BY fiscal_year, fiscal_quarter ORDER BY date_day) AS day_of_fiscal_quarter,
ROW_NUMBER() OVER (PARTITION BY fiscal_year ORDER BY date_day) AS day_of_fiscal_year,
TO_CHAR(date_day, 'MMMM') AS month_name,
TRUNC(date_day, 'Month') AS first_day_of_month,
LAST_VALUE(date_day) OVER (PARTITION BY year_actual, month_actual ORDER BY date_day) AS last_day_of_month,
FIRST_VALUE(date_day) OVER (PARTITION BY year_actual ORDER BY date_day) AS first_day_of_year,
LAST_VALUE(date_day) OVER (PARTITION BY year_actual ORDER BY date_day) AS last_day_of_year,
FIRST_VALUE(date_day) OVER (PARTITION BY year_actual, quarter_actual ORDER BY date_day) AS first_day_of_quarter,
LAST_VALUE(date_day) OVER (PARTITION BY year_actual, quarter_actual ORDER BY date_day) AS last_day_of_quarter,
FIRST_VALUE(date_day) OVER (PARTITION BY fiscal_year, fiscal_quarter ORDER BY date_day) AS first_day_of_fiscal_quarter,
LAST_VALUE(date_day) OVER (PARTITION BY fiscal_year, fiscal_quarter ORDER BY date_day) AS last_day_of_fiscal_quarter,
FIRST_VALUE(date_day) OVER (PARTITION BY fiscal_year ORDER BY date_day) AS first_day_of_fiscal_year,
LAST_VALUE(date_day) OVER (PARTITION BY fiscal_year ORDER BY date_day) AS last_day_of_fiscal_year,
DATEDIFF('week', first_day_of_fiscal_year, date_actual) +1 AS week_of_fiscal_year,
CASE WHEN EXTRACT('month', date_day) = 1 THEN 12
ELSE EXTRACT('month', date_day) - 1 END AS month_of_fiscal_year,
LAST_VALUE(date_day) OVER (PARTITION BY first_day_of_week ORDER BY date_day) AS last_day_of_week,
(year_actual || '-Q' || EXTRACT(QUARTER FROM date_day)) AS quarter_name,
(fiscal_year || '-' || DECODE(fiscal_quarter,
1, 'Q1',
2, 'Q2',
3, 'Q3',
4, 'Q4')) AS fiscal_quarter_name,
('FY' || SUBSTR(fiscal_quarter_name, 3, 7)) AS fiscal_quarter_name_fy,
DENSE_RANK() OVER (ORDER BY fiscal_quarter_name) AS fiscal_quarter_number_absolute,
fiscal_year || '-' || MONTHNAME(date_day) AS fiscal_month_name,
('FY' || SUBSTR(fiscal_month_name, 3, 8)) AS fiscal_month_name_fy,
(CASE WHEN MONTH(date_day) = 1 AND DAYOFMONTH(date_day) = 1 THEN 'New Year''s Day'
WHEN MONTH(date_day) = 12 AND DAYOFMONTH(date_day) = 25 THEN 'Christmas Day'
WHEN MONTH(date_day) = 12 AND DAYOFMONTH(date_day) = 26 THEN 'Boxing Day'
ELSE NULL END)::VARCHAR AS holiday_desc,
(CASE WHEN HOLIDAY_DESC IS NULL THEN 0
ELSE 1 END)::BOOLEAN AS is_holiday,
DATE_TRUNC('month', last_day_of_fiscal_quarter) AS last_month_of_fiscal_quarter,
IFF(DATE_TRUNC('month', last_day_of_fiscal_quarter) = date_actual, TRUE, FALSE) AS is_first_day_of_last_month_of_fiscal_quarter,
DATE_TRUNC('month', last_day_of_fiscal_year) AS last_month_of_fiscal_year,
IFF(DATE_TRUNC('month', last_day_of_fiscal_year) = date_actual, TRUE, FALSE) AS is_first_day_of_last_month_of_fiscal_year,
DATEADD('day',7,DATEADD('month',1,first_day_of_month)) AS snapshot_date_fpa,
DATEADD('day',44,DATEADD('month',1,first_day_of_month)) AS snapshot_date_billings
FROM date_spine
), final AS (
SELECT
date_day,
date_actual,
day_name,
month_actual,
year_actual,
quarter_actual,
day_of_week,
first_day_of_week,
week_of_year,
day_of_month,
day_of_quarter,
day_of_year,
fiscal_year,
fiscal_quarter,
day_of_fiscal_quarter,
day_of_fiscal_year,
month_name,
first_day_of_month,
last_day_of_month,
first_day_of_year,
last_day_of_year,
first_day_of_quarter,
last_day_of_quarter,
first_day_of_fiscal_quarter,
last_day_of_fiscal_quarter,
first_day_of_fiscal_year,
last_day_of_fiscal_year,
week_of_fiscal_year,
month_of_fiscal_year,
last_day_of_week,
quarter_name,
fiscal_quarter_name,
fiscal_quarter_name_fy,
fiscal_quarter_number_absolute,
fiscal_month_name,
fiscal_month_name_fy,
holiday_desc,
is_holiday,
last_month_of_fiscal_quarter,
is_first_day_of_last_month_of_fiscal_quarter,
last_month_of_fiscal_year,
is_first_day_of_last_month_of_fiscal_year,
snapshot_date_fpa,
snapshot_date_billings
FROM calculated
)
** I believe the gitlab team uses Snowflake so if you're using another platform, you may need to change a few functions **