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ORACLE interview question: Under what circumstances will DB2 allow an SQL statement to update more than one primary key value at a time? posted for Database Architect/ Designer and DB2 Job skill

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Defining a primary key on a table is optional and you can only define a single primary key on a table. A primary key constraint can consist of one or many columns (up to 32). Any column that is defined as a primary key column is automatically set with a NOT NULL status.

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cur.execute("CREATE TABLE friends(id INTEGER PRIMARY KEY, name TEXT);") In SQLite, INTEGER PRIMARY KEY column is auto incremented. There is also an AUTOINCREMENT keyword. When used in INTEGER PRIMARY KEY AUTOINCREMENT a slightly different algorithm for Id creation is used.

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By the way, if your code does not give you the "The record does not exist" error, then those fields are probably not part of the primary key. By the way 2, you don't need to do TRANSFERFIELD(FALSE), because FALSE is the default value.

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Sep 05, 2013 · for updating primary key using linq to sql. you need to remove primary key constarint and make unique constrant. that will work since each row will be unique on the basis of this field. Sumit Jain Remember to click Mark as Answer on the post that helps to others.

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Aug 17, 2017 · Note that primary keys are most likely to be used as foreign keys, but other UNIQUE columns can also be used. Adding a Foreign Key to a Table To add foreign keys, the first step is to create the columns in the “ books ” table that will store the references to the other tables.

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INSERT, UPDATE, DELETE, MERGE, and SELECT statements can be created. CREATE TABLE, DROP TABLE, CREATE VIEW, DROP VIEW are optional. The key used in UPDATE, DELETE, and MERGE is specified by setting the key column. Now it is easy to merge csv into a database table by using the new Generate MERGE feature.

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Here if id is the primary key then after first insertion with id='1' every time attempt to insert id='1' will update name and age and previous name age will change.

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Summary: in this tutorial, you will learn about the SQL triggers concept and how to develop simple triggers in the database system.. Introduction to SQL Triggers. A trigger is a piece of code executed automatically in response to a specific event occurred on a table in the database.

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Returns true if a record exists in the table that matches the id or conditions given, or false otherwise. The argument can take five forms: Integer - Finds the record with this primary key. String - Finds the record with a primary key corresponding to this string (such as '5').
Sep 17, 2009 · In the table we actually have three fields: id (a PRIMARY KEY), value we are searching for, and stuffing. The latter field is a VARCHAR(200) and filled with asterisks. This field emulates values in actual tables that makes the tables large in size. Since the tables in Oracle are heap organized by default, no index contains values of both id and ...
Apr 17, 2017 · Delete and Update Rules. You can create Foreign key constraints by referencing a primary or unique key from a parent table. With Foreign key constraints, we make sure the relational integrity of data in the parent and child tables. A foreign key value could be “NULL”, which means that particular record has no record in the parent table.
specifies a foreign key, that is, a set of columns whose values are linked to the values of the primary key variable in another table (the table-name that is specified for REFERENCES). The referential-actions are performed when the values of a primary key column that is referenced by the foreign key are updated or deleted.
It most likely contain duplicates of the data that makes up your unique primary key. The where not exists does not protect against this because SQL is set based. You most likely need to either change the definition of your PK, change the content of the #StudentGrades table or change the select statement to give unique rows.

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Primary key defines a realtionship between two tables. A table in SQL must have a primary key associated with it to uniquely identify its records. A table in SQL is indexed by default based on its primary key. Primary key may or may not be unique but can be comprised of multiple fields.
First, specify the name of the table that you want to drop after the DROP TABLE keywords. Second, use the IF EXISTS option to remove the table only if it exists. If you remove a table that does not exist, PostgreSQL issues an error. To avoid this situation, you can use the IF EXISTS option. The following example to check if a primary key exists. CREATE TABLE PRODUCT. (. ID INT NOT NULL IDENTITY(1,1), SKU VARCHAR(20) NOT NULL, TITLE VARCHAR(200) NOT NULL, PRICE MONEY NOT NULL, DESCRIPTION VARCHAR(2000) NULL, DTCREATE DATETIME NULL.