Connect with other users. The Toad World Forums is your place to ask and find answers to questions, and discuss Toad for IBM DB2 with other users, whether you're a new customer or an existing one. May 13, 2010 This article explored the various types of constraints supported by DB2 for Linux, UNIX, and Windows, including the NOT NULL constraint, the unique constraint, the primary key constraint, the foreign key (referential) constraint, and table check constraints. How to find out foreign key on DB2 tables. Syscat.references - db2look. Look for 'DDL Statements for foreign keys on Table tablename in the output. How to Find Primary Keys and Foreign Keys in a DB2 Table? How do I find primary keys and foreign keys in a DB2 table? I couldn't find them in systables or syscolumns of sysibm tables. Share this A. Asked Saturday May 31, 2003. Updated Wednesday March 06, 2019. Primary Key: Select this checkbox to set the attribute to be a part of primary key. Not Null: Select this checkbox to set the attribute Not Null. See NotNull Property for PK and AK Attributes for more information. Unique: Select this checkbox to set the attribute as unique. See Unique Attributes for more information. Data Type selection box.
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Hi, this is Jeff Podlasek with Toad DB2 Development. I'm going to cover some of the key DBA features that are available in Toad for DB2-- for DB2 on z/OS or DB2 on the mainframe. I've got Toad up and running. And I've got a Database Explorer open. And the first thing I want to talk about is the ability to easily generate DDL for any type of object. Every time you select an object on the left-hand side of the database explorer, you will see a script tab on the right-hand side of the Explorer. You can very quickly and easily go there. And it will generate the DDL for that object. You can then right-click if you wanted to and then open up that DDL in an Editor. That's one way of getting the DDL for a given object. Toad has many variations of and ways of getting DDL. That's one. Another would be just to right-click and generate-- select Generate SQL, and then select Creation Script. And this will actually open up a creation script inside a SQL Editor. So that's another way of getting the DDL for a given object. Another way is to use the Extract DDL Wizard. To invoke that, you would right-click and you would select Extract DDL. And up comes the Extract DDL Wizard. This gives you the option. It's a little more powerful than the script tab or just sending the DDL to an Editor because it gives the option of selecting referenced objects and dependent objects. And you could get very granular as to which objects you want to generate with the selected object. But once you hit Build Script, a background task is going to start. And it's going to generate the DDL and then open up a SQL Editor. And you can see now that a SQL Editor has been opened with all the DDL for that object and all its referenced independent objects. I'm Can shut this down. And I'm just going to bring up the Script Map. So rather quickly we can see what type of objects have been generated. So this table has some views, has some indexes, et cetera. So that's the generated script from the Extract DDL Wizard. I'm going to shut this down now. And I'm just going to show you another example. If I jumped over to Databases, one thing that's known is that you could invoke Extract DDL with any type of object. So I picked, let's say, Extract DDL with a database. And from the Wizard, I say, Include Dependents. That's going to bring in and create the DDL for not only the database, but all the tablespaces in that database and then the tables within those tablespaces. So I'm going to click Build Script again and drive it. And I got a background task is executed. You can see that the task is executing in the task bar. And then a script tab will open when that is complete. You can see that a SQL editor session was opened with the script that was generated. Again, I'm going to bring up Script Map and refresh. Now you can see all the statements that were generated. You want to jump to a statement, you just double-click on it in the Script Map. You can see that there's plenty of create table, create tablespace statements that were created because I wanted all the referenced, or the dependent objects, for that database, as I selected in the Extract DDL Wizard. So those are some of the quick and easy ways to generate DDL using Toad for DB2 on z/OS.
SQL FOREIGN KEY Constraint
A FOREIGN KEY is a key used to link two tables together.
A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.
The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.
Look at the following two tables:
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'Persons' table:
PersonID | LastName | FirstName | Age |
---|---|---|---|
1 | Hansen | Ola | 30 |
2 | Svendson | Tove | 23 |
3 | Pettersen | Kari | 20 |
'Orders' table:
OrderID | OrderNumber | PersonID |
---|---|---|
1 | 77895 | 3 |
2 | 44678 | 3 |
3 | 22456 | 2 |
4 | 24562 | 1 |
Notice that the 'PersonID' column in the 'Orders' table points to the 'PersonID' column in the 'Persons' table.
The 'PersonID' column in the 'Persons' table is the PRIMARY KEY in the 'Persons' table.
The 'PersonID' column in the 'Orders' table is a FOREIGN KEY in the 'Orders' table.
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. Magic dvd ripper key generator.
The FOREIGN KEY constraint also prevents invalid data from being inserted into the foreign key column, because it has to be one of the values contained in the table it points to.
SQL FOREIGN KEY on CREATE TABLE
Iobit driver booster pro key generator. The following SQL creates a FOREIGN KEY on the 'PersonID' column when the 'Orders' table is created:
MySQL:
CREATE TABLE Orders (
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);
SQL Server / Oracle / MS Access:
CREATE TABLE Orders (
OrderID int NOT NULL PRIMARY KEY,
OrderNumber int NOT NULL,
PersonID int FOREIGN KEY REFERENCES Persons(PersonID)
);
OrderID int NOT NULL PRIMARY KEY,
OrderNumber int NOT NULL,
PersonID int FOREIGN KEY REFERENCES Persons(PersonID)
);
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
CREATE TABLE Orders (
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
CONSTRAINT FK_PersonOrder FOREIGN KEY (PersonID)
REFERENCES Persons(PersonID)
);
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
CONSTRAINT FK_PersonOrder FOREIGN KEY (PersonID)
REFERENCES Persons(PersonID)
);
SQL FOREIGN KEY on ALTER TABLE
To create a FOREIGN KEY constraint on the 'PersonID' column when the 'Orders' table is already created, use the following SQL:
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MySQL / SQL Server / Oracle / MS Access:
ALTER TABLE Orders
ADD FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
ADD FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
To allow naming of a FOREIGN KEY constraint, and for defining a FOREIGN KEY constraint on multiple columns, use the following SQL syntax:
MySQL / SQL Server / Oracle / MS Access:
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ALTER TABLE Orders
ADD CONSTRAINT FK_PersonOrder
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
ADD CONSTRAINT FK_PersonOrder
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID);
DROP a FOREIGN KEY Constraint
To drop a FOREIGN KEY constraint, use the following SQL:
MySQL:
ALTER TABLE Orders
DROP FOREIGN KEY FK_PersonOrder;
DROP FOREIGN KEY FK_PersonOrder;
SQL Server / Oracle / MS Access:
ALTER TABLE Orders
DROP CONSTRAINT FK_PersonOrder;
DROP CONSTRAINT FK_PersonOrder;