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If a column in a table is optional, we can insert a new record or update an existing record without adding a value to the column. This means that the field will be saved with a NULL value. NULL values are treated differently from other values. NULL is used as a placeholder for unknown or inapplicable values. Note: NULL and 0 cannot be compared; they are not equivalent. is not NULL instance 5> CREATE TABLE Billings ( 6> bankerid INTEGER, 7>

If a column in the table is optional, We can insert a new record or update an existing record without adding a value to the column. This means that the field will be saved as a NULL value. The Processing Method of the NULL value is different from that of other values. NULL is used as a placeholder for unknown or unsuitable values. Note: NULL and 0 cannot be compared; they are not equivalent. Isnotnull instance 5 gt; createtableBillings (6 gt; nbsp; if a column in the table is optional, we ca

access through multithreading. For more information about writing multi-threaded Java programs, see Alex Roetter's article "Writing multi-threaded Java applications" (developerWorks, November February 2001 ). For technical help on multithreading in your Java application, visit the multi-threaded Java programming forum. Brian Goetz easily handles difficult thread problems in a three-part series. The JUnit homepage provides links to many interesting articles about program testing methods

an introductory tutorial explaining the basic knowledge of neural networks. OpenNN's paid support is provided by arteltner, a Spanish company engaged in predictive analysis.OpenCycOpenCyc developed by Cycorp provides access to the Cyc knowledge base and a common sense reasoning engine. It has more than 239,000 entries, about 2,093,000 Triplet and about 69,000 owl: a namespace similar to a link to an external semantic library. It has good applications

IPhone and iPadMany applicationsProgramBut it is not enough. To allow more people to see and download some applications from applications with a total of 0.1 million, these designers are exhausted. Websites with these applications are usually well-designed. visiting these websites allows you to download their applications on your own. Of course, this is their goal. Here are 57 web pages I have collected about iPhone and iPad apps. 1. airphones 2. taptaptap 3. tapbots 4. Things

development members said on the blog. We want to build a traceable system and create an active discussion community for IE7. The change in Microsoft's policy has officially broken through many of the previous restrictions on obtaining bug information from the public. Now, everyone can see the problems that IE is highlighting today, and the potential security threats. Microsoft said: "Real-time bugs" will be submitted through normal security channels and ensure rapid arrival. You can also ma

Many iphone app sites have a "common denominator": there are beautiful and inspiring designs. They look very appealing. Rich colors, beautiful large words, pictures, space and the application of reflection is so amazing. The visual appeal of these sites makes browsing the web so comfortable that you can choose the smart apps if you have an iphone. I've been looking for sites that inspire me, and I've found that websites that choose these iphone apps can make a great list! So, the following bring