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SQL was designed as a language for database definition, manipulation, and control Table 42 shows a quick summary of important SQL statements Only database administra tors use most of the database definition and database control statements You have already seen the CREATE TABLE statement in 3 This chapter and 9 cover the database manipulation statements Power users and analysts use the database manipulation statements 10 covers the CREATE VIEW statement The CREATE VIEW state ment can be used by either database administrators or analysts 11 covers the CREATE TRIGGER statement used by both database administrators and analysts 14 covers the GRANT, REVOKE, and CREATE ASSERTION statements used primarily by database administrators The transaction control statements (COMMIT and ROLLBACK) presented in 15 are used by analysts SQL can be used in two contexts: stand-alone and embedded In the stand-alone context, the user submits SQL statements with the use of a specialized editor The editor alerts the user to syntax errors and sends the statements to the DBMS The presentation in this chapter assumes stand-alone usage In the embedded context, an executing program submits SQL statements, and the DBMS sends results back to the program The program includes

A Comparison A comparison can be made here between the levels presented in Table 1-1 and the operation of a railroad

1 The conceptual level concerns itself with the idea of value added due to the transportation of the goods and their relevance to the economic structure 2 The descriptive level concerns itself with scheduling, train sizes, and equipment

Pay careful attention to the declaration Some other computer languages use commas to separate the array dimensions; C/C++, in contrast, places each dimension in its own set of brackets Similarly, to access point 1,2 of array d, you would use

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Statements CREATE SCHEMA, TABLE, VIEW ALTER TABLE SELECT UPDATE, DELETE, INSERT COMMIT, ROLLBACK GRANT, REVOKE CREATE ASSERTION CREATE TRIGGER Purpose Define a new database, table, and view Modify table definition Retrieve contents of tables Modify, remove, and add rows Complete, undo transaction Add and remove access rights Define integrity constraint Define database rule

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required to exist in every record A brute force approach using such an index will cost TX = TF + (n 1) TN serially 3-65 If one can follow the space-allocation pointers, seeks need to be done only once per block, so that here the read time for a consecutively allocated le would be similar to the time needed to read a sequential le The records appear to the user in a random order random seq 3-66a TX = nR/t If the blocks are distributed randomly or found from the space allocation in a random fashion, then, neglecting the time needed to read the space-allocation directory, n B random 3-66b TX = (s + r + ) Bfr t still improving on Eq 3-65 In both of these approaches the records appear in a logically unpredictable order A reduction in actual search e ciency may be due to the processing of empty spaces created by previous deletions Indexed les are not as dependent on periodic reorganization as are the previous le organizations Some implementations of indexed les in fact never need to reorganize the les Reorganization of the data le may recover unusable fragments of space left over from deletions A speci c index may require reorganization to recover from updating failures or from having poorly distributed index entries due to clustered insertions or deletions Index reorganization can be done incrementally, one index at a time In order to reconstruct one index, the data le is read A reorganization of an index separately would propagate any existing errors in the index It is best to use the space-allocation directory, not only for speed but also to assure that every record is read Since the records will not appear from the data le in the proper logical sequence for the index attribute, it is best to collect them in a dense temporary le having n small (V + P ) records, then sort this le, and then generate the index blocks sequentially Index generation can be combined with the nal sort-merge pass, as will be pesented in Sect 3-7.

d[1][2]

SQL statements along with statements of the host programming language such as Java or Visual Basic Additional statements allow SQL statements (such as SELECT) to be used in side a computer program 11 covers embedded SQL

TY (one) = TX + Tsort (n )

one index 3-67

The following example loads a two-dimensional array with the numbers 1 through 12 and prints them row by row

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