To find the constraint name in SQL Server, use the viewtable_constraintsin theinformation_schemaschema. The columntable_namegives you the name of the table in which the constraint is defined, and the columnconstraint_namecontains the name of the constraint. The columnconstraint_typeindicates the ...
You want to find the names of the constraints in a table in Oracle. Example We want to display the names of the constraints in the table student. Solution SELECT constraint_name, constraint_type, table_name FROM user_constraints WHERE table_name = 'STUDENT'; Here is the result: constraint...
How to change columns in a unique constraint Over time you may want to add or remove columns from a unique constraint. As with check constraints, you'll need to create a new constraint and drop the original. The process for doing this online has an extra step: Create a newunique indexon...
Depending on your situation you may need to only change the collation of a few columns or possible every column in your database. You can use the following query which will list any columns in your database that have the default collation. SELECT t.name "Table Name", c.name "Column Name...
On the first node in the cluster only follow the below steps: Login as postgres user and initialize the database: Raw # Login as postgres user $ su - postgres # Create directory for use with replication. $ mkdir /var/lib/pgsql/pg_archive # Change to data directory and initialize databa...
SQL Check an Alter Table The SQL ALTER TABLE statement’s check constraint creation syntax is given here: ALTER TABLE name ADD CONSTRAINT name CHECK (col_name (condition)); The above syntax description is given as: TABLE name:The name of the table we want to change by including a check ...
In thePrimary keysection, you can give a name to your primary key constraint and also add or remove columns: That’s not all! Vertabelo generates a SQL code for you when you click onSQL preview: The primary key constraint is generated within theCREATE TABLEstatement. ...
Use the following command to create the database. CreatedatabaseMySQLDemoDb SQL Copy Here "MySQLDemoDb" is our database name. Now step by step, we learn about the SQL table and constraint. Step 1. Here, we will create two table(Parent and Child). We will create "tblMyEmployee...
You can see this in the screenshots of the previous tutorial. We can now close the message box and the Experimental Instance, go back to our development instance of Visual Studio, change the message that the message box should display and try to run it again just to make sure that every...
name, is_disabled, is_not_trusted, definition, OBJECT_NAME(parent_object_id)ASTableName FROMsys.check_constraints WHEREOBJECT_NAME(parent_object_id)='CountryList' It means that the check constraint has not been verified by the system for all rows. SQL Server uses the check constraint to impr...