Stack Overflow on Andy M Mallon - AM²

Enforce a specific constraint to be checked first?

Fri, 06 Oct 2023 21:09:33 -0400

Question

I have the following SQL Server table :

create table Account(
 -- column names with their data types and properties
 Id int not null identity primary key,
 User varchar(50) not null,
 Job varchar(200) not null,
 
 -- table limitations
 constraint UniqueUserPerAccount unique (User),
 constraint UniqueJobPerAccount unique (Job),
)

For the two constraints I listed the more important constraint first hoping that if both constraints are violated, the first one would be triggered and displayed to the user. However, it appears the constraints are declared alphabetically by column name and therefore if both constraints fail, the UniqueJobPerAccount error, and only this error, is stated to have been violated.

How do I put the result of stored procedure in a new column in a view?

Sun, 17 Oct 2021 06:10:18 -0400

Question

I have created a stored procedure which takes as inputs a schema name and a table name and outputs an INT containing the largest value in the id column of the table. I have also created a view containing all the schema names, table names, and primary key column names in my database. I would like to add a column to this view containing the result of my stored procedure, using the schema name and table name values as inputs to the row’s stored procedure. I have tried a few different things, but I can’t find a way to do it.

Function to create SQL TABLE does not works well using Powershell

Thu, 02 Sep 2021 11:41:40 -0400

Question

I need to get the values from a Excel Sheet (in a shared folder) to export it and then create a SQL Table in my instance. After of this I will execute a Stored Procedure (I already created) in order to create extended properties for a specific schema on tables,columns and rows.

How to convert from nchar to decimal in SQL?

Mon, 10 May 2021 18:29:23 -0400

Question

I have 2 tables(source and destination) which are respectively NOR_LABOR and ALL_LABOR_DETAILS. In the source table(NOR_LABOR) there is a column feet_produced with the data type nchar(10). In the destination table(ALL_LABOR_DETAILS) there’s a column labor_feet_produced with the data type decimal(18,4). I want to convert the feet_produced from nchar(10) to decimal(18,4) and paste it in the ALL_LABOR_DETAILS table’s labor_feet_produced column.

Recursive CTE in SQL Server to count blocking sessions

Mon, 18 May 2020 19:54:25 -0400

Question

I’m trying to make CTE to count blocking sessions on server. Currently I made a function to do so(returns blocking session amount). But still could not write this query with CTE.

 CREATE FUNCTION dbo.SESSIONS(@SESSION int)
 RETURNS INT
 AS 
 BEGIN
 DECLARE @returnValue int =0
 SET @returnValue = @returnValue + (			
 			SELECT isNULL((
 			SELECT (SELECT COUNT(session_id) FROM sys.dm_exec_requests R2 WHERE blocking_session_id =R1.blocking_session_id) AS [BLOCKING]
 			FROM sys.dm_exec_requests r1 
 WHERE blocking_session_id = R3.session_id
 			GROUP BY blocking_session_id), 0)
 			FROM sys.dm_exec_sessions R3 where session_id=@SESSION)
 
 	DECLARE @s int = (SELECT MAX(session_id) FROM sys.dm_exec_requests
 			 WHERE blocking_session_id = @SESSION)

 	IF @s IS NOT NULL
 	BEGIN
 		SET @returnValue = @returnValue + dbo.SESSIONS(@s)
 	END
 
 	RETURN @returnValue
 END

asked 2022-05-18 by mortu

I have 3 tables with dates to which I want to join to a date dimension table but it is returning many duplicates with left joins

Tue, 16 Aug 2016 11:55:03 -0400

Question

I have 4 tables with dates to which I want to join to a date dimension table but it is returning many duplicates with left joins.

Tables are basically a date field which I want to count.

Will Transaction Log backup to Nul break Always On Availability Group configuration?

Mon, 31 Aug 2015 23:08:35 -0400

Question

Imagine we have two nodes participating in SQL 2012 AO. This is a test instance. During one of the index rebuild operation the log was grown up really big (250 GB). We are unable to back it up due to space constraint. What if we backup the Tlog to Nul (just to shrink it down) – will that break Always On?

Restoring a SQL Server 2012 database in high availability

Wed, 12 Nov 2014 14:42:35 -0500

Question

I have a database which is in always-on high availability mode synchronized with another database on a different instance. How can I restore from a .bak file into the primary database using T-SQL?

I’m new to high availability and I’ve been advised that I need to take the database out of high availability before I can do a restore and then put it back in high availability again but I’m not sure.