define a primary key

... each record, such as a Customer ID. This How-To discusses what the best candidates are for primary keys, as well as how to create them and other indexes. You have created a base table and have ... Indexes are used to improve performance when querying data, such as searching on fields and sorting information. The primary key is an index that ensures that you have at least one unique value ... entered data into it. How do you make sure that you have a way of finding specific records? LastName and FirstName fields won't work because you can have duplicates of those. You also want...

Ngày tải lên: 14/12/2013, 20:16

... the UpdateCommand of the DataAdapter needs to locate the row based on the original primary key and update the primary key value with the current value of the primary key in addition to updating ... Primary Key Value Problem You changed a primary key value in a DataTable and updated the change back to the underlying data source, but the value in the data source remained unchanged. You need ... System.Data; using System.Data.SqlClient; private const String TABLENAME = "TBL0408"; private DataTable dt; private SqlDataAdapter da; // . . . private void UpdatePrimaryKeyForm_Load(object...

Ngày tải lên: 26/01/2014, 10:20

... parent table. Updating the Primary Key of a Parent Table and Pushing the Change to the Database In this section you'll learn what happens if you attempt to update the primary key in a ... DataTable. This is the default. None Indicates that no action takes place. SetDefault Indicates that the DataColumn values in the child DataTable are to be set to the value in the DefaultValue ... the parent DataTable on which the ForeignKeyConstraint was created, then the same change is also made in any corresponding DataRow objects in the child DataTable. You should set UpdateRule...

Ngày tải lên: 24/12/2013, 01:17

... DataTable parentTable = new DataTable(PARENTTABLENAME); cols = parentTable.Columns; col = cols.Add(PARENTID_FIELD, typeof(Guid)); col.DefaultValue = Guid.NewGuid( ); parentTable.PrimaryKey ... the DataSet and create the relationship. ds = new DataSet( ); Table 4-2. DataRowAction enumeration Value Description Add The row has been added to the table. Change The row has been changed. ... be changed after each row is added to the table so that each row has a different GUID primary key value. This is done by handling the RowChanging event for each table. When a row has been added,...

Ngày tải lên: 21/01/2014, 11:20

... must have taken b. must have been taken c. can't have been taken d. can't have taken 29. The garden ________. It has just started raining. a. needn't water b. needn't be watered c. ... reviewed 12. As for me, I consider reading ________ important part of ________ life. a. an / Ø b. the / a c. Ø / the d. an / a 13. Anne says that she reads about half ________ hour a day, at least. a. a ... because a pack of sharks follow the trail to Santiago's boat ________. a. so that the marlin is bitten largely by each of them b. it is taken an enormous bite by each shark c. and each shark...

Ngày tải lên: 23/07/2013, 01:25

... by d. Taliban -> b 9. You are many more intelligent than I thought you are. a. many b. than c. thought d. are -> a III. Grammar and Vocabulary 10. Public libraries to all readers. a. open b. ... winner of the art competition a prize. a. awarded b. were being awarded c. was awarding d. was being awarded  d 46. When I arrived, the train had left. a. never b. yet c. already d. suddenly ... 11: 1. a. hear b. dear c. tear d. bear > d 2. a. dead b. head c. weather d. seat > d 3. a. please b. nose c. lose d. house > d 4. a. main b. saint c. said d. maid > c 5. a. barn b....

Ngày tải lên: 21/08/2013, 00:10

... mmc and then press ENTER. d. On the Console menu, click Add/Remove Snap-in. e. In the Add/Remove Snap-in dialog box, click Add. f. On the Add Standalone Snap-in dialog box, click Certificates ... click Add, and then click Close. g. Click OK to close the Add/Remove Snap-in dialog box. h. On the Console menu, click Save As. i. In the Save As dialog box, type Certificate Management ... Designing a Public Key Infrastructure Copyright  2002 Microsoft Corporation. All Rights Reserved. Tasks Detailed Steps Why was the Base-64 encoded binary x.509 certificate format selected?...

Ngày tải lên: 19/10/2013, 02:15

... different ways. An interface cannot exist as an object: It has no code and no place to store object data. A class that implements an interface has an explicit contract with the interface: The class ... You can also create properties that accept a parameter. For example, in the Northwind database, a customer might have many orders. A parameterized property would be a perfect way to access ... 9.1 Define a Class in Visual Basic .NET Before writing code, you should take a moment to decide what data the class needs to contain and what actions a developer (whether it is you or a teammate)...

Ngày tải lên: 07/11/2013, 15:15

... organism per se. These infiltrates can appear within a matter of days and can clinically simulate acute bacterial pneumonia. Anti-tubercular treatment has been considered to be an important factor ... was able to maintain 90% oxygen saturation (SaO 2 ) at room air. Anti-tuberculosis therapy was continued and at 12 weeks he was maintaining oxygen saturation (SaO 2 ) of 94% at room air. He was ... tuberculous bronchopneumonia, was able to maintain oxygen saturation (SaO 2 ) of 96% at room air, while patient with tuberculous pneumonia in case 2 was able to maintain SaO 2 of 90% at room air at six weeks. Organ...

Ngày tải lên: 06/03/2014, 04:20

... a share of assets of all commercial banks. “Z- Score” is estimated as ROA+equity/assets/sd(ROA); the standard deviation of ROA, sd(ROA), is estimated as a 5-year moving average. Source: Based ... banks, and other financial institutions. “Costs/Income” is measured as total costs, as a share of total income of all commercial banks. “Interest margins” equals the accounting value of a bank's ... (LFS): Database. http://epp.eurostat.ec.europa.eu/portal/page/portal/employment_unemployment_lfs/data/ database (accessed December 19, 2011). European Council. 199 2a. The Maastricht Treaty–Provisions...

Ngày tải lên: 06/03/2014, 19:20

... mission that we regard it as the only im- portant expressive act, and assume that all other activity must be practical in an animalian way, or else irrational—playful, or atavistic (residual) past ... magic" rests on a mistaken view of causality. After all, a savage who beats a tom-tom to drive off his brother's malaria would never make such a practical mistake as to shoot his arrow ... language." 5 An interpretation of observed facts that adjusts them to a general scientific outlook, a theory that bridges what used to appear as a saltus naturae, a logical explanation...

Ngày tải lên: 14/03/2014, 17:25

... pair (5¢-ATGGAGGCCGGAGATTTCAAAG-3¢, +1 to +22 bp; and 5¢-ACGGGCTTTAAGTATTTCATCAGGC-3¢, +1405 to +1428 bp) and actin primer pair (5¢-TTCGAGCAG GAGATGGCCACC-3¢ and 5¢-GAGATCCACATCTGYTG GAAGGT-3¢). ... Yoichi Hayakawa 2 1 Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Japan 2 Department of Applied Biological Science, Saga University, Japan Animal color patterns have ... ReverTra Ace (TOYOBO). The cDNA was amplified with TH-specific primer pair (5¢-CAGCTGCCCAGAAGAACCGCGAGA TG-3¢, +11 to +36; and 5¢-GAACTCCACGGTGAACC AGT-3¢, +1286 to +1305 bp), DDC-specific primer pair (5¢-ATGGAGGCCGGAGATTTCAAAG-3¢,...

Ngày tải lên: 16/03/2014, 11:20

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Ngày tải lên: 19/06/2014, 22:20

Ngày tải lên: 20/06/2014, 08:20