Mar 24, 2010 · SELECT items FROM item INNER JOIN requestitem ON item.items = requestitem.item WHERE requestitem.request_no = Whatever_Request_Number_You_Want Or how about: SELECT items FROM item INNER JOIN requestitem ON item.items = requestitem.item INNER JOIN request ON requestitem.request_no = request.request_no WHERE request.requester_name = 'Whatever ...

Dec 30, 2021 · We use INFORMATION_SCHEMA.TABLE_CONSTRAINTS to display the constraints. Here, we display the name(CONSTRAINT_NAME) and the type of the constraint(CONSTRAINT_TYPE) for all existing constraints. Syntax: SELECT INFORMATION FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE TABLE_NAME='TABLE_NAME'; Query:

Jul 6, 2014 · ALTER TABLE TITLE ADD CONSTRAINT U_TITLEID UNIQUE(TITLE_ID), primary key (TITLE_ID); add constraint C_CATEGORY CHECK(CATEGORY='DRAMA' OR 'COMEDY' OR 'ACTION' OR 'CHILD' OR 'SCIFI' OR 'DOCUMENTARY'; Also: is it possible to add the above code to the code preceding it and execute both of them in the same sql query? How do I fix this?

Mar 16, 2013 · Use this (table level check constraint): x VARCHAR2(20), . y NUMBER(2) NOT NULL, CONSTRAINT fk_cons FOREIGN KEY(x) REFERENCES user_info(user_id), CONSTRAINT null_cons CHECK(x IS NOT NULL) Or (use NOT NULL constraint on column): x VARCHAR2(20) NOT NULL, . y NUMBER(2) NOT NULL, CONSTRAINT fk_cons FOREIGN KEY(x) REFERENCES user_info(user_id)

Dec 17, 2020 · We can create a table with more than one constraint in its columns. Following example shows how we can define different constraints on a table. Sr_no is a Primary Key. Branch_no is the foreign key referencing Branch table. Sr_no in Fd_master where pk is userdefined name given to Primary key.

SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the table. If there is any violation between the constraint and the data action, the action is aborted. Constraints can be column level or table level.

Jan 30, 2025 · SQL constraints are rules applied to columns or tables in a relational database to limit the type of data that can be inserted, updated, or deleted. These rules ensure the data is valid, consistent, and adheres to the business logic or database requirements. Constraints can be enforced during table creation or later using the ALTER TABLE statement.

In order to filter certain results from being returned, we need to use a WHERE clause in the query. The clause is applied to each row of data by checking specific column values to determine whether it should be included in the results or not. SELECT column, another_column, … FROM mytable. WHERE condition AND/OR another_condition AND/OR …;

Feb 13, 2009 · Let’s look at a SELECT query now. If we run this: soh.ShipDate, sod.OrderQty, sod.UnitPrice, p.Name AS ProductName. ON sod.SalesOrderID = soh.SalesOrderID. ON p.ProductID = sod.ProductID. The...

Oct 11, 2022 · To find details about the constraints, you can query the USER_CONSTRAINTS view. SELECT * FROM user_constraints; You can add WHERE clauses for particular tables if you need to.