free barcode generator source code in vb.net Associate some remarks with the TARGET and SALES columns of the OFFICES table. in Software

Creating Code 128 Code Set A in Software Associate some remarks with the TARGET and SALES columns of the OFFICES table.

Associate some remarks with the TARGET and SALES columns of the OFFICES table.
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COMMENT ON OFFICES (TARGET IS 'This is the annual sales target for the office', SALES IS 'This is the year-to-date sales for the office')
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Because this is a capability carried forward from some of the earliest IBM SQL products, Oracle also supports the COMMENT ON statement for attaching comments to tables and columns. The comments are not stored inline with other table and column information, however. They are accessible via the Oracle system views USER_TAB_COMMENTS and USER_COL_COMMENTS. The DB2 COMMENT capability has been expanded over the years to allow comments on constraints, stored procedures, schemas, tablespaces, triggers, and other DB2 database objects. This capability is not part of the SQL standard and has generally not been adopted by other major DBMS products.
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The System Catalog
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The DB2 COMMENT statement syntax diagrams
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Relationship Information
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With the introduction of referential integrity into the major enterprise DBMS products during the mid-1990s, system catalogs were expanded to describe primary keys, foreign keys, and the parent/child relationships that they create. In DB2, which was among the first to support referential integrity, the description is provided by the SYSCAT. REFERENCES system catalog table, described in Table 16-8. Every parent/child relationship between two tables in the database is represented by a single row in the SYSCAT.REFERENCES table. The row identifies the names of the parent and child tables, the name of the relationship, and the delete and update rules for the relationship. You can query it to find out about the relationships in the database: List all of the parent/child relationships among my tables, showing the name of the relationship, the name of the parent table, the name of the child table, and the delete rule for each one.
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SELECT CONSTNAME, REFTABNAME, TABNAME, DELETERULE FROM SYSCAT.REFERENCES WHERE DEFINER = USER DATABASE STRUCTURE
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SQL: The Complete Reference
Column Name
CONSTNAME TABSCHEMA TABNAME DEFINER REFKEYNAME REFTABSCHEMA REFTABNAME COLCOUNT DELETERULE
Data Type
VARCHAR(18) CHAR(8) VARCHAR(18) CHAR(8) VARCHAR(18) CHAR(8) VARCHAR(18) SMALLINT CHAR(1)
Information
Name of constraint described by this row Schema containing the constraint Table to which constraint applies Creator of table to which constraint applies Name of parent key Schema containing parent table Name of parent table Number of columns in the foreign key Delete rule for foreign key constraint (A = no action, C = cascade, R = restrict, and so on) Update rule for foreign key constraint (A = no action, R = restrict) Creation time of constraint Names of foreign key columns Names of primary key columns
UPDATERULE CREATE_TIME FK_COLNAMES PK_COLNAMES Table 16-8.
CHAR(1) TIMESTAMP VARCHAR(320) VARCHAR(320)
The SYSCAT.REFERENCES View (DB2)
List all of the tables related to the SALESREPS table as either a parent or a child.
SELECT FROM WHERE UNION SELECT FROM WHERE REFTABNAME SYSCAT.REFERENCES TABNAME = 'SALESREPS' TABNAME SYSCAT.REFERENCES REFTABNAME = 'SALESREPS'
16:
The System Catalog
The names of the foreign key columns and the corresponding primary key columns are listed (as text) in the FK_COLNAMES and PK_COLNAMES columns of the REFERENCES system table. A second system table, SYSCAT.KEYCOLUSE, shown in Table 16-9, provides a somewhat more useful form of the information. There is one row in this system table for each column in each foreign key, primary key, or uniqueness constraint defined in the database. A sequence number defines the order of the columns in a compound key. You can use this system table to find out the names of the columns that link a table to its parent, using a query like this one: List the columns that link ORDERS to PRODUCTS in the relationship named ISFOR.
SELECT FROM WHERE ORDER COLNAME, COLSEQ SYSCAT.KEYCOLUSE CONSTNAME = 'ISFOR' BY COLSEQ
The primary key of a table and the parent/child relationships in which it participates are also summarized in the SYSCAT.TABLES and SYSCAT.COLUMNS system tables, shown previously in Tables 16-2 and 16-4. If a table has a primary key, the KEYCOLUMNS column in its row of the SYSCAT.TABLES system table is nonzero, and tells how many columns make up the primary key (one for a simple key; two or more for a composite key). In the SYSCAT.COLUMNS system table, the rows for the columns that make up the primary key have a nonzero value in their KEYSEQ column.
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