CASE x WHEN null THEN is the same as CASE WHEN x = null THEN. But nothing equals null in that way. This means that you are always getting the ELSE part of your CASE statement. And that means that you are trying to concatenate a string with NULL, which always yields NULL. You need ...
This means that decorating a column with either "NOT NULL PRIMARY KEY" or just "PRIMARY KEY" should do the same thing. But you are relying on the SQL engine in question correctly following the SQL standard. As an example due to an early bug, SQL Lite does not correctly implement the st...
SQL NOT NULL ConstraintBy default, a column can hold NULL values.The NOT NULL constraint enforces a column to NOT accept NULL values.This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field...
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details. ---> Npgsql.PostgresException (0x80004005): 23502: null value in column "Address_StreetName" of relation "Persons" violates not-null constraint ...
Array's IN SQL SERVER? ASCII values for extended characters Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or update Attempt to fetch logi...
The crux of the matter is that when I designed the table of houses, I meant NULL to be “none”, “no heating”. Unlike SQL which means NULL to be “perhaps coal or gas or etc or nothing”. Therefore, in my intent, NULL cannot possibly be coal or wood, so I expect IN to not...
It's not hard to update the whole addrs module and msg module to version 10, but it takes a lot of time, so I'm not in a hurry because I think I've achieved the goal of the menu and CRUD skeleton code B12phpfw . A lot of time in the previous sentence means that SW tools ...
would map to Nullable<Nullable<SomeStruct>>. Nullable<T> has an implicit conversion from null. In this conversion it creates a nullable object and set's HasValue to null and leaves the Value as the default. This means that myInt will be an instance of Nullable with HasValue false. Value ...
"The designers of String.Concat chose to treat null concatenation as empty string concatenation. Which means that (string)null + (string)null gives you an empty string in C#, bizarrely enough" MS SQL has the same behavior if you SET CONCAT_NULL_YIELDS_NULL OFF which happened to have burned...
this is incompatible with sql_mode=only_full_group_byHow to repeat:CREATE TABLE `aa` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `is_deleted` tinyint(4) NOT NULL DEFAULT '0' , `balance` decimal(12,2) NOT NULL DEFAULT '0.00' , PRIMARY KEY (`id`) ); CREATE TABLE `aa1...