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variable aa=null it is not to be judged. Although AA is indeed empty. Even in the selection conditions are not judged. I don't know why, I had to use NVL () This function to judge. Outside of the condition can be judged by the AA is null. Add a little to the Six. It is important to note that the parameter name cannot be the same as the database field name when you write the stored procedure. Otherwise Oracle will treat this parameter name as a field name, even if you distinguish it from the a

Recommend blog rules All users of the csdn Blog have the opportunity to recommend their blog posts to the homepage of the blog channel. When posting a blog, select "publish to the csdn blog homepage. User recommendation requ

Blog setting and Optimization for online blog marketing This article is excerpted from the book "password of network marketing practice-strategies, skills, and cases" Whether you are using a third-party blog platform or your own domain name, you must set up your blog after you select a platform or install software. Of

Use blog to improve Google ranking Two of the most popular songs in the music industry some time ago: "mouse loves rice" and "two butterflies". In the baidu search rankings, the search volume of these two keywords increases every day, although Google does not have a list of popular keywords, it can be inferred that the daily search volume is more than 0.1 million. However, if you search for these two keywords on Google, it will surprise you, the homep

Recently, I am confused about csdn's blog point calculation rules. I have seen a csdn blog titled how to calculate csdn's blog points: "ranking score of the blog ranking = sum of all essays on the personal blog and the number of readings on the article + sum of all comments

Blog platform selection and Optimization This article is excerpted from the book "password of network marketing practice-strategies, skills, and cases" Currently, there are two options for blog writing: First, you can place your blog on the hosting platform of the blog service provider, and most

Blogs make money. There are many profit models for blogs, and there are also many discussions about making money on blogs on the Internet. Blog marketing columns will also be written using blogs to make moneyArticle. This article is an induction and summarization made by colleagues and is of reference significance. Blog marketing: The first advertising alliance in