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Data Control Language (DCL), 48 Data De nition Language (DDL), 47 ALTER TABLE statement, 78 80 basic commands, 70 CHECK constraints, 73, 75 column constraints, 72 74 column de nition, 71 72 CREATE DATABASE statement, 70 CREATE INDEX statement, 76 77 CREATE TABLE statement, 70 77 CREATE VIEW statement, 77 78 DEFAULT clause, 72 ON DELETE clause, 74 DROP statement, 80 NULL | NOT NULL constraint, 73 PRIMARY KEY constraint, 74, 75 referential (FOREIGN KEY) constraint, 74, 76

Figure 17-21.

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17:

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After the SELECT statement has been executed, the value of the indicator variable tells the program how to interpret the returned data: I An indicator value of zero means the host variable has been assigned a retrieved value by the DBMS The application program can use the value of the host variable in its processing I A negative indicator value means the retrieved value was NULL The value of the host variable is irrelevant and should not be used by the application program I A positive indicator value indicates a warning condition of some kind, such as a rounding error or string truncation Because you cannot tell in advance when a NULL value will be retrieved, you should always specify an indicator variable in the INTO clause for any column of query results that may contain a NULL value.

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If the SELECT statement produces a column containing a NULL value and you have not specified an indicator variable for the column, the DBMS will treat the statement as an error and return a negative SQLCODE Thus, indicator variables must be used to successfully retrieve rows containing NULL data Although the major use of indicator variables is for handling NULL values, the DBMS also uses indicator variables to signal warning conditions For example, if an arithmetic overflow or division by zero makes one of the query results columns invalid, DB2 returns a warning SQLCODE of +802 and sets the indicator variable for the affected column to -2 The application program can respond to the SQLCODE and examine the indicator variables to determine which column contains invalid data DB2 also uses indicator variables to signal string truncation.

syntax conventions, 54 table constraints, 74 76 UNIQUE constraint, 74, 75 Data Manipulation Language (DML), 47 48, 173 175 DELETE statement, 180 181 INSERT statement, 175 178 single row inserts using the VALUES clause, 176 177 tuning, 254 255 UPDATE statement, 179 180 Data Query Language (DQL), 47 column name aliases, 90 conjunctive operators, 97 100 logical operators, 100 107 SELECT command, 87, 88 89 sorting results, 90 93 WHERE clause, 94 107 data types, 54 55 Boolean, 60 character, 55 56 large object types, 60 Microsoft Access variations, 60 61 numeric, 56 58 SQL:2003, 55 60 temporal, 58 59 database management systems, de ned, 2 3 database objects, 2 database privileges, 192 193 database transactions, 48, 206 and relational DBMSs, 206 207 support in DB2 UDB, 210 211 support in Microsoft SQL Server, 207 208 support in MySQL, 209 210 support in Oracle, 209 support in Sybase Adaptive Server, 208 databases, de ned, 2

If the query results contain a column of character data that is too large for the corresponding host variable, DB2 copies the first part of the character string into the host variable and sets the corresponding indicator variable to the full length of the string The application program can examine the indicator variable and may want to retry the SELECT statement with a different host variable that can hold a larger string These additional uses of indicator variables are fairly common in commercial SQL products, but the specific warning code values vary from one product to another They are not specified by the ANSI/ISO SQL standard Instead, the SQL2 standard specifies error classes and subclasses to indicate these and similar conditions, and the program must use the GET DIAGNOSTICS statement to determine more specific information about the host variable causing the error..

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