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Even if you could use a host variable in this way (and you cannot), another problem would immediately arise. The number of columns produced by the query in the second statement would vary, depending on which table was specified by the host variable. For the OFFICES table, the query results would have six columns; for the SALESREPS table, they would have nine columns. Furthermore, the data types of the columns would be different for the two tables. But to write a FETCH statement for the query, you must know in advance how many columns of query results there will be and their data types, because you must specify a host variable to receive each column:

exec sql fetch cursor7 into :var1, :var2, :var3;

exec sql describe bind list for thestmt into the_sqlda;

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As this discussion illustrates, if a program must be able to determine at runtime which SQL statements it will use, or which tables and columns it will reference, static SQL is inadequate for the task. Dynamic SQL overcomes these limitations. Dynamic SQL has been supported by the IBM SQL products since their introduction, and it has been supported for many years by the minicomputer-based and UNIX-based commercial RDBMS products. However, dynamic SQL was not specified by the original ANSI/ISO SQL1 standard; the standard defined only static SQL. The absence of dynamic SQL from the SQL1 standard is ironic, given the popular notion that the standard allowed you to build front-end database tools that are portable across many different DBMS brands. In fact, such front-end tools must almost always be built using dynamic SQL. In the absence of an ANSI/ISO standard, DB2 set the de facto standard for dynamic SQL. The other IBM databases of the day (SQL/DS and OS/2 Extended Edition) were nearly identical to DB2 in their dynamic SQL support, and most other SQL products also followed the DB2 standard. Official support for dynamic SQL was added to the SQL standard in 1992 (version SQL2), mostly following the path set by IBM. The SQL standard does not require dynamic SQL support at the lowest level of compliance (Entry), but dynamic SQL support is required for products claiming the Intermediate or Full compliance levels to the SQL standard.

This Oracle statement has no DB2 equivalent. Following this DESCRIBE statement, your program would typically examine the information in the SQLDA, fill in the pointers in the SQLDA to point to the parameter values the program wants to supply, and then execute the statement using the SQLDA form of the OPEN or EXECUTE statement:

18:

If the unique values restriction applies to a set of two or more columns (that is, the combination of values for those columns must be unique for all rows in the table), then the table constraint form should be used A referential (FOREIGN KEY) constraint can appear as a column constraint or a table constraint If the foreign key consists of a single column, the column constraint may be more convenient If it consists of multiple columns, it should be specified as a table constraint If a table has many foreign key relationships to other tables, it may be most convenient to gather all of its foreign key constraints together at one place in the table definition, rather than having them scattered throughout the column definitions A CHECK constraint can appear as a column constraint or a table constraint.

exec sql execute thestmt using descriptor the_sqlda; exec sql open qrycursor using descriptor the_sqlda;

Dynamic SQL*

The information returned by both forms of the Oracle DESCRIBE statement is the same, and is described in the next section.

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