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that has a matching value in the OFFICE column (in the row for the New York office). Similarly, to find all the salespeople who work in New York, you could note the OFFICE value for the New York row (11) and then scan down the REP_OFFICE column of the SALESREPS table looking for matching values (in the rows for Mary Jones and Sam Clark). The parent/child relationship between a sales office and the people who work there isn t lost by the relational model, it s just not represented by an explicit pointer stored in the database. Instead, the relationship is represented by common data values stored in the two tables. All relationships in a relational database are represented this way. One of the main goals of the SQL language is to let you retrieve related data from the database by manipulating these relationships in a simple, straightforward way. asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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Free download for .NET EAN 13 Barcode Generator trial package to create & generate EAN 13 barcodes in ASP . NET , WinForms applications using C# & VB. A column in one table whose value matches the primary key in some other table is called a foreign key. In Figure 4-9, the REP_OFFICE column is a foreign key for the OFFICES table. Although REP_OFFICE is a column in the SALESREPS table, the values that this column contains are office numbers. They match values in the OFFICE column, which is the primary key for the OFFICES table. Together, a primary key and a foreign key create a parent/child relationship between the tables that contain them, just like the parent/child relationships in a hierarchical database. Table 1-2 asp.net ean 13 Reading barcode EAN 13 in asp . net , C# - CodeProject
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... Figure 4-10. the sun heating air, and so yet again we have another solar-driven process! Tidal power is not a result of the sun the tides that encircle the earth are a result of the gravitational pull that the moon has on the bodies of water that cover our planet. However, wave power which has a much shorter period, is a result of the wind blowing on the surface of the water just as the wind is a solar-driven process, so is wave power. getMessage() getSQLState() getErrorCode() getNextException() Table 19-20. Retrieves error message describing the exception Retrieves SQLSTATE value (5-char string, as described in 17) Retrieves driver-specific or DBMS-specific error code Moves to next SQL exception in a series Video Store Database Table Columns (Continued) to the executeQuery method. If you specify scrollability, the ResultSet returned by the executeQuery call offers some additional methods for cursor control. The important methods are listed in Table 19-21. In addition to scrollable result sets, later versions of the JDBC specification added support for updateable result sets. This capability corresponds to the UPDATE WHERE CURRENT OF capability in embedded SQL. It allows an update to specific columns of this row, which is indicated by the current position of a cursor. Updateable result sets also allow new rows of data to be inserted into a table via a result set. Scrollable cursor motion previous() beforeFirst() first() last() afterLast() absolute() relative() Table 19-21. Moves cursor to previous row of query results Moves cursor before the start of the results Moves cursor to first row of query results Moves cursor to last row of query results Moves cursor past end of the results Moves cursor to absolute row number indicated Moves cursor to relative row number indicated Cursor position sensing isFirst() isLast() isBeforeFirst() isAfterLast() moveToInsertRow() moveToCurrentRow() asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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