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For referential integrity to hold in a relational database, any column in a base table that is declared a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. [2] In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table. For ...
The extracted relations are amended with foreign keys referring to the primary key of the relation which contained it. The process can be applied recursively to non-simple domains nested in multiple levels. [4] In this example, Customer ID is the primary key of the containing relations and will therefore be appended as foreign key to the new ...
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
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It was only after calling his utility provider, Pacific Gas & Electric Company (PG&E), that it was discovered he’d been charged for his neighbor’s power usage for nearly two decades. His bill ...
One program — bill forecast alerts — gives customers a warning when their energy use is up. “It gives you time to reduce your home’s energy use before your next statement arrives ...
The Pacific Gas and Electric Company (PG&E) is an American investor-owned utility (IOU). [2] The company is headquartered at Kaiser Center, in Oakland, California.PG&E provides natural gas and electricity to 5.2 million households in the northern two-thirds of California, from Bakersfield and northern Santa Barbara County, almost to the Oregon and Nevada state lines.
2. In the left navigation menu, click My Wallet | select View My Bill. - The Billing Statement page will appear. 3. From the dropdown menu, select the time period you want to view. Note - You can print your statement by clicking on the Print Statement button.