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Stairway to Exploring Database Metadata

Idempotent DDL Scripts That Always Achieve The Same Result - Making Changes Only Once: Stairway to Exploring Database Metadata Level 6

Idempotence is the property of certain operations in mathematics and computer science, that can be applied multiple times without changing the result beyond the first time they are run. When you are making changes to a database to deploy a new version, you need to be sure that certain changes aren’t made twice, or in the wrong order.

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2023-10-04 (first published: )

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SQLServerCentral Article

Reading and Writing your Database's Documentation using JSON

One of the problems to which I keep returning is finding the best way to read and apply documentation for databases. As part of a series of articles I'm doing for Redgate's Product Learning, I've been demonstrating how to maintain a single source of database documentation, in JSON, and then add and update the object […]

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2021-06-28 (first published: )

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SQLServerCentral Editorial

Malleable Source Control

Git has proved to be a better fit to the needs and workflow of a database development team than anything that came before. Git is valuable because it encourages branching and merging, giving more choice in the way that your team can work. Due to the ease with which you can adapt Git, there is […]

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2021-04-03

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Stairway to Exploring Database Metadata

Exploring Facts About SQL Server Tables: Stairway to Exploring Database Metadata Level 5

Now that we've explored, in preceding levels, some of the information that is available about indexes, triggers, keys and distribution statistics, we can concentrate on the tables themselves and their columns.

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2021-01-13 (first published: )

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return:

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

See possible answers