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conditions x = ( 1300 and 1500) Note that to delete loans we must delete tuples from both the loan and borrower relations Delete all accounts at all branches located in Brooklyn account D depositor D branch account-number y customer-name branch-name x balance
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Note that, in expressing a deletion, we can reference relations other than those from which we are deleting information
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To insert data into a relation, we either specify a tuple to be inserted or write a query whose result is a set of tuples to be inserted We do the insertion by placing the I operator in the query expression Obviously, the attribute values for inserted tuples must be members of the attribute s domain The simplest insert is a request to insert one tuple Suppose that we wish to insert the fact that account A-9732 at the Perryridge branch has a balance of $700 We write
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II Relational Databases
5 Other Relational Languages
The McGraw Hill Companies, 2001
5
Other Relational Languages
account I
account-number A-9732
branch-name Perryridge
balance 700
We can also insert a tuple that contains only partial information To insert information into the branch relation about a new branch with name Capital and city Queens, but with a null asset value, we write branch I branch-name Capital branch-city Queens assets
More generally, we might want to insert tuples on the basis of the result of a query Consider again the situation where we want to provide as a gift, for all loan customers of the Perryridge branch, a new $200 savings account for every loan account that they have, with the loan number serving as the account number for the savings account We write account I depositor I loan account-number x customer-name y loan-number x branch-name Perryridge balance 200
account-number x amount
branch-name Perryridge
borrower
customer-name y
loan-number x
To execute the preceding insertion request, the system must get the appropriate information from the borrower relation, then must use that information to insert the appropriate new tuple in the depositor and account relations
5173 Updates
There are situations in which we wish to change one value in a tuple without changing all values in the tuple For this purpose, we use the U operator As we could for insert and delete, we can choose the tuples to be updated by using a query QBE, however, does not allow users to update the primary key elds Suppose that we want to update the asset value of the of the Perryridge branch to $10,000,000 This update is expressed as branch branch-name Perryridge branch-city assets U10000000
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
II Relational Databases
5 Other Relational Languages
The McGraw Hill Companies, 2001
Query-by-Example
The blank eld of attribute branch-city implies that no updating of that value is required The preceding query updates the assets of the Perryridge branch to $10,000,000, regardless of the old value There are circumstances, however, where we need to update a value by using the previous value Suppose that interest payments are being made, and all balances are to be increased by 5 percent We write account account-number branch-name balance U x * 105
This query speci es that we retrieve one tuple at a time from the account relation, determine the balance x, and update that balance to x * 105
518 QBE in Microsoft Access
In this section, we survey the QBE version supported by Microsoft Access While the original QBE was designed for a text-based display environment, Access QBE is designed for a graphical display environment, and accordingly is called graphical query-by-example (GQBE)
An example query in Microsoft Access QBE
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
II Relational Databases
5 Other Relational Languages
The McGraw Hill Companies, 2001
5
Other Relational Languages
Figure 52 shows a sample GQBE query The query can be described in English as Find the customer-name, account-number, and balance for all accounts at the Perryridge branch Section 514 showed how it is expressed in QBE A minor difference in the GQBE version is that the attributes of a table are written one below the other, instead of horizontally A more signi cant difference is that the graphical version of QBE uses a line linking attributes of two tables, instead of a shared variable, to specify a join condition An interesting feature of QBE in Access is that links between tables are created automatically, on the basis of the attribute name In the example in Figure 52, the two tables account and depositor were added to the query The attribute account-number is shared between the two selected tables, and the system automatically inserts a link between the two tables In other words, a natural join condition is imposed by default between the tables; the link can be deleted if it is not desired The link can also be speci ed to denote a natural outer-join, instead of a natural join Another minor difference in Access QBE is that it speci es attributes to be printed in a separate box, called the design grid, instead of using a P in the table It also speci es selections on attribute values in the design grid Queries involving group by and aggregation can be created in Access as shown in Figure 53 The query in the gure nds the name, street, and city of all customers who have more than one account at the bank; we saw the QBE version of the query earlier in Section 516 The group by attributes as well as the aggregate functions
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