Not null key

I hope this tutorial helps you to solve your error. Please Comment Below if You stucks anywhere with my code. Table of Contents. How to Solve The parameter 'key' can't have a value of 'null' because of its type, and no non-null default value is provided Error? Foreign Key is used to relate two tables. The relationship between the two tables matches the Primary Key in one of the tables with a Foreign Key in the second table.

If you try to insert any incorrect data, DBMS will return error and will not allow you to insert the data. There are two ways to maintin the integrity of data in Child table, when a particular record is deleted in the main table. When two tables are connected with Foriegn key, and certain data in the main table is deleted, for which a record exits in the child table, then we must have some mechanism to save the integrity of data in the child table.

CHECK constraint is used to restrict the value of a column between a range. It performs check on the values, before storing them into the database. Its like condition checking before saving data into a column. Learn CSS. Learn JavaScript. C Language C Tutorial. C Compiler. Standard Template Library. Python Python Tutorial. Python Programs. Python How Tos. Numpy Module. Matplotlib Module. In this case, the constraint rules will be applied to more than one column in the specified table.

Adding the constraint after creating the table, the existing data will be checked for the constraint rule before creating that constraint. There are six main constraints that are commonly used in SQL Server that we will describe deeply with examples within this article and the next one.

These constraints are:. Let us start discussing each one of these SQL Server constraints with a brief description and practical demo. By default, the columns are able to hold NULL values. This table contains only two columns, ID and Name. If the null-ability is not specified while defining the column, it will accept the NULL value by default:.

Messi and 3. You should remove the second line Also, Import-Csv only works with single-character delimiters, so you'll need to save your file with such a delimiter such as comma or tab because, at least as it appears in the question, you have multiple spaces between your fields and Import-Csv Try this perhaps? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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