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The main body of the SQL language consists of about 40 statements. The most important and frequently used statements are summarized in Table 5-1. Each statement requests a specific action from the DBMS, such as creating a new table, retrieving data, or inserting new data into the database. All SQL statements have the same basic form, illustrated in Figure 5-1. Every SQL statement begins with a verb, a keyword that describes what the statement does. CREATE, INSERT, DELETE, and COMMIT are typical verbs. The statement continues with one or more clauses. A clause may specify the data to be acted on by the statement or provide more detail about what the statement is supposed to do. Every clause also begins with a keyword, such as WHERE, FROM, INTO, and HAVING. Some clauses are
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Data Manipulation SELECT INSERT DELETE UPDATE Data Definition CREATE TABLE DROP TABLE ALTER TABLE Table 5-1.
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Retrieves data from the database Adds new rows of data to the database Removes rows of data from the database Modifies existing database data Adds a new table to the database Removes a table from the database Changes the structure of an existing table
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CREATE VIEW DROP VIEW CREATE INDEX DROP INDEX CREATE SCHEMA DROP SCHEMA CREATE DOMAIN ALTER DOMAIN DROP DOMAIN Access Control GRANT REVOKE Transaction Control COMMIT ROLLBACK SET TRANSACTION Programmatic SQL DECLARE EXPLAIN OPEN FETCH CLOSE PREPARE EXECUTE DESCRIBE Table 5-1.
Description
Adds a new view to the database Removes a view from the database Builds an index for a column Removes the index for a column Adds a new schema to the database
RETRIEVING DATA
Removes a schema from the database Adds a new data value domain Changes a domain definition Removes a domain from the database Grants user access privileges Removes user access privileges Ends the current transaction Aborts the current transaction Defines data access characteristics of the current transaction Defines a cursor for a query Describes the data access plan for a query Opens a cursor to retrieve query results Retrieves a row of query results Closes a cursor Prepares a SQL statement for dynamic execution Executes a SQL statement dynamically Describes a prepared query
Major SQL Statements (continued)
SQL: The Complete Reference
Figure 5-1.
The structure of a SQL statement
optional; others are required. The specific structure and content vary from one clause to another. Many clauses contain table or column names; some may contain additional keywords, constants, or expressions. The ANSI/ISO SQL standard specifies the SQL keywords that are used as verbs and in statement clauses. According to the standard, these keywords cannot be used to name database objects, such as tables, columns, and users. Many SQL implementations relax this restriction, but it s generally a good idea to avoid the keywords when you name your tables and columns. Table 5-2 lists the keywords included in the ANSI/ISO SQL2 standard, which roughly tripled the number of keywords reserved by the earlier SQL1 standard.
ABSOLUTE ACTION ADD ALL ALLOCATE ALTER AND Table 5-2.
CROSS CURRENT CURRENT_ DATE CURRENT_ TIME CURRENT_ TIMESTAMP CURRENT_ USER CURSOR
GET GLOBAL GO GOTO GRANT GROUP HAVING
NEXT NO NOT NULL OCTET_ LENGTH OF ON
SPACE SQL SQLCODE SQLERROR SQLSTATE SUBSTRING SUM
ANSI/ISO SQL2 Keywords
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ANY ARE AS ASC ASSERTION AT
DATE DAY DEALLOCATE DEC DECIMAL DECLARE
HOUR IDENTITY IMMEDIATE IN INDICATOR INITIALLY INNER INPUT
ONLY OPEN OPTION OR ORDER OUTER OUTPUT OVERLAPS
SYSTEM_ USER TABLE TEMPORARY THEN TIME TIMESTAMP TIMEZONE_ HOUR TIMEZONE_ MINUTE TO TRAILING TRANSACTION TRANSLATE TRANSLATION TRIM TRUE UNION UNKNOWN UPDATE UPPER USAGE
RETRIEVING DATA
AUTHORIZATION DEFAULT AVG BEGIN BETWEEN BIT BIT_ LENGTH BOTH BY CASCADE CASCADED CASE CAST CATALOG CHAR CHARACTER CHAR_ LENGTH CHARACTER_ LENGTH CHECK Table 5-2. DEFERRABLE DEFERRED DELETE DESC DESCRIBE DESCRIPTOR DISCONNECT DISTINCT DOMAIN DOUBLE DROP ELSE END ENDEXEC ESCAPE EXCEPT
INSENSITIVE PAD INSERT INT INTEGER INTERSECT INTO IS ISOLATION JOIN KEY LANGUAGE LAST LEADING LEFT LEVEL PARTIAL POSITION PRECISION PREPARE PRESERVE PRIMARY PRIOR PROCEDURE PUBLIC READ REAL
DIAGNOSTICS INTERVAL
PRIVILEGES UNIQUE
REFERENCES USER RELATIVE RESTRICT USING VALUE
ANSI/ISO SQL2 Keywords (continued)
SQL: The Complete Reference
CLOSE COALESCE COLLATE COLLATION COLUMN COMMIT CONNECT CONNECTION CONSTRAINT CONSTRAINTS CONTINUE CONVERT COUNT CREATE Table 5-2.
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