When designing an SQL database, there may be cases where you want to impose restrictions on what data can be added to certain columns in a table. SQL makes this possible through the use ofconstraints. After applying a constraint to a column or table, any attempts to add data to the colu...
As mentioned in the introduction, views arevirtual tables. This means that although a view is functionally similar to a table, it is a different type of structure since the view doesn’t hold any data of its own. Instead, it pulls in data from one or morebase tablesthat actually hold th...
SQL Server Management Studio AKA SSMS is the most popular and powerful tool to manage, configure, administer and do other uncountable operations in SQL Server. So, we can create a view through SSMS. We will launch SSMS and login the database with any user who granted to create a view. Ex...
Database design – including where and how to use constraints – is essential to the correct function of your database. To properly implement database constraints in SQL Server, you must understand all the requirements and execute them accordingly. How would you do this? This article will explai...
MS SQL Server Operators: CONSTRAINT PRIMARY KEY FOREIGN KEY UNIQUE DEFAULT CHECK Table of Contents Problem Example Solution Discussion Problem You want to find the names of the constraints in a table in SQL Server. Example We want to display the names of the constraints in the tablestudent. ...
SQL check constraint and user-defined functions A scalar-valued user-defined function returns a single value after its invocation. We can use this type of function in the check constraints to define a data validation rule. At the same time, we can pass the inserted data value to this functio...
--Use sys.all_sql_modules system view to get information if table is used --in a Stored Procedure SELECTOBJECT_NAME(OBJECT_ID),definition FROMsys.all_sql_modules WHEREdefinitionLIKE'%vw_Employee%'
dba_cons_columns: provides information about the column of all constraints in the database and requires DBA privileges. We can use the view according to the access we have to the Oracle database. Now I am going to explain how to check all constraints on a table in Oracle using the exampl...
Check constraints or partition function of source table ALTER TABLE with variable TableName ALTER vs UPDATE when creating a new column with default value. Alternate queries for MERGE Alternative for OR in WHERE clause Alternative for PIVOT Alternative of CURSOR in SQL to improve performance ?
The preexisting indexes are available to concurrent users for select, insert, update, and delete operations. This includes bulk inserts (supported but not recommended during an online index operation) and implicit updates by triggers and referential integrity constraints. All preexisting indexes are av...