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The SYSCOLUMNS Table (Informix)

Part IV:

/* the string "SQLCA /* /* /* /* /* /* /* /*

The DB2 catalog specifies data types in text form (for example, CHARACTER); the Informix catalog uses integer data type codes. Other differences reflect the different capabilities provided by the two DBMS brands: DB2 allows you to specify up to 254 characters of remarks about each column; Informix does not provide this feature. The Informix system table keeps track of the minimum and maximum length of actual data values stored in a variable-length column; this information is not available directly from the DB2 system catalog.

" */

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A SQL2 check constraint is a search condition, like the search condition in a WHERE clause, that produces a true/false value. When a check constraint is specified for a column, the DBMS automatically checks the value of that column each time a new row is inserted or a row is updated to insure that the search condition is true. If not, the INSERT or UPDATE statement fails. A column check constraint is specified as part of the column definition within the CREATE TABLE statement, described in 13. Consider this excerpt from a CREATE TABLE statement, modified from the definition of the demo database to include three check constraints: CREATE TABLE SALESREPS (EMPL_NUM INTEGER NOT NULL CHECK (EMPL_NUM BETWEEN 101 AND 199), AGE INTEGER CHECK (AGE >= 21), . . . QUOTA MONEY CHECK (MONEY >= 0.0) . . . The first constraint (on the EMPL_NUM column) requires that valid employee numbers be three-digit numbers between 101 and 199. The second constraint (on the AGE column) similarly prevents hiring of minors. The third constraint (on the QUOTA column) prevents a salesperson from having a quota target less than $0.00. All three of these column check constraints are very simple examples of the capability specified by the SQL2 standard. In general, the parentheses following the keyword CHECK can contain any valid search condition that makes sense in the context of a column definition. With this flexibility, a check constraint can compare values from two different columns of the table, or even compare a proposed data value against other values from the database. These capabilities are more fully described later in this chapter.

The definitions of the views in a database are usually stored by the DBMS in the system catalog. The DB2 catalog contains two system tables that keep track of views. The SYSCAT. VIEWS table, described in Table 16-7, contains the SQL text definition of each view. Older versions of DB2 supported SQL text up to 3600 characters, and definitions exceeding that size were stored in multiple rows, with sequence numbers 1, 2, 3, and so on. Newer versions of DB2 use a CLOB column that accommodates view definitions up to 64K in size, so only one row in the SYSCAT.VIEWS table is required for each view.

length of SQLCA, in bytes */ SQL status code */ length of sqlerrmc array data */ name(s) of object(s) causing error */ diagnostic information */ various counts and error code */ warning flag array */ extension to sqlwarn array */

Data Type VARCHAR(128) VARCHAR(128) VARCHAR(128) SMALLINT CHAR(1)

/* SQL status code */

Information Schema containing the view Name of the view User-id of person who created the view Sequence number for this row of SQL text (always 1 for DB2 UDB) Type of view checking: N = No check option L = Local check option C = Cascaded check option Whether view is read-only (Y/N) Whether view definition is valid (Y/N) Name of the default schema at the time the object was defined Path for resolving function calls in view SQL text of view definition ( SELECT ); data type VARCHAR(3600) in older versions of DB2

/* A 'W' in any of the SQLWARN fields signals a warning condition; otherwise these fields each contain a blank */ #define #define #define #define #define #define #define #define SQLWARN0 SQLWARN1 SQLWARN2 SQLWARN3 SQLWARN4 SQLWARN5 SQLWARN6 SQLWARN7 sqlca.sqlwarn[0] sqlca.sqlwarn[1] sqlca.sqlwarn[2] sqlca.sqlwarn[3] sqlca.sqlwarn[4] sqlca.sqlwarn[5] sqlca.sqlwarn[6] sqlca.sqlwarn[7] /* /* /* /* /* /* /* /* master warning flag */ string truncated */ NULLs eliminated from column function */ too few/too many host variables */ prepared UPDATE/DELETE without WHERE */ SQL/DS vs DB2 incompatibility */ invalid date in arithmetic expr */ reserved */

CHAR(1) CHAR(1) VARCHAR(128) VARCHAR(254) CLOB(64K)

- 214 -

` Figure 17-9.

TABLE 16-7

17:

The SYSCAT.VIEWS View (DB2)

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