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> Select 1 from dual where null= '; No records found. Sql> Select 1 from dual where ' = '; No records found. Sql> Select 1 from dual where null is null; 1 --------- 1 Sql> Select 1 from dual where NVL (null,0) =NVL (null,0); Got is all the data that's empty and not empty 1 --------- 1 The null value is added, subtract, multiply, divide and so on operation, the result is still empty. Sql> select 1+null from dual; Sql> select 1-null from dual; Sql> select 1*null from dual; Sql> sel

these features and dynamically splice image URLs; 2) use the sizes and srcset attributes in HTML, the picture tag, or the image-set attribute in CSS to implement responsive images. Solution 1 is very simple. I skipped it here. solution 2 has many related articles on the Internet. If you are not familiar with it, you can search for "responsive images. Here, let's take a look at the responsive Image Code (via) implemented by picture, sizes, and srcset mentioned in solution 2 ): HTML media="(min-

= null; no records found SQL> select 1 from dual where null = ''; SQL> select 1 from dual where ''=''; SQL> select 1 from dual where null is null; 1 --------- 1 SQL> select 1 from dual where nvl (null, 0) = nvl (null, 0 ); 1 --------- 1 add, subtract, multiply, and divide null values, and the result is still null. SQL> select 1 + null from dual; SQL> select 1-null from dual; SQL> select 1 * null from dual; SQL> select 1/null from dual; A record is found. note: This record is the null setting in

Use @ media to implement several key resolutions in web page self-adaptation, and @ media It is often difficult to adjust the layout of devices with different resolutions or window sizes. You can use @ media screen to adapt the webpage layout, but how to be compatible with all mainstream devices becomes a problem. When is the resolution set?Method/step 1Let's take a look at the following code, which is traversed from bootstrap. min-width is used to confirm that768, 992,

: This article mainly introduces the problem of nginx domain name redirection. if you are interested in the PHP Tutorial, please refer to it. At the customer's request, we need to assign a domain name to the customer. then, we recommend that you do not have a domain name server in the background. this is not safe. domain names are generally configured on external web servers; Install nginx with another blog post, and then modify the configuration file as follows: Server {Listen 80; ---------- f

Original from Https://hashnode.com/post/how ... In most cases, developers need to use and query JSON data from other services. Querying JSON documents is time consuming. In the past few days, I was writing a package for Golang to easily query JSON data. This idea and inspiration comes from Nahid Bin Azhar's Php-jsonq. Let's look at a sample JSON data: { "name":"computers", "description":"List of computer products", "vendor":{ "name":"Star Trek", "email":"info@example.com", "

; -webkit-animation-name:prop-1200; -moz-animation-name:prop-1200; -ms-animation-name:prop-1200; -o-animation-name:prop-1200; animation-name:prop-1200;}. Cloud-1,. cloud-2 {width:82px; height:90px; Background-image:url (images/clouds/1.png); -webkit-anim

Getline of awkTo learn more about getline, you must first understand the concepts of $0, NR, and FNR.The so-called NR can be interpreted as Number of Record, or a row Number, while FNR can be interpreted as Number of Record in File or a row Number in the File. It sounds no different. In fact, if you only have one file for awk processing, NR and FNR are the same thing, as shown below, the same file bbs-list-3, for each row of output NR and FNR are the same.Manu @ manu :~ /Code/shell/awk $ cat bbs

Often headaches for different resolution devices or layouts with different window sizes, you can use @media screen to adapt to the layout of your Web page, but it's a problem to be compatible with all major devices. What is the resolution setting?First look at the following code, which is traversed from the bootstrap, min-width to confirm that the difference is768, 992, 1200. Of course, in the past there are some equipment width is 600 480, which smal

Often headaches for different resolution devices or layouts with different window sizes, you can use @media screen to adapt to the layout of your Web page, but it's a problem to be compatible with all major devices. What is the resolution setting?First look at the following code, which is traversed from the bootstrap, min-width to confirm that the difference is768, 992, 1200. Of course, in the past there are some equipment width is 600 480, which smal

Using @media to realize several key resolutions in Web page self-adaptationOften headaches for different resolution devices or layouts with different window sizes, you can use @media screen to adapt to the layout of your Web page, but it's a problem to be compatible with all major devices. What is the resolution setting? First look at the following code, which is traversed from the bootstrap, min-width to confirm that the difference is768, 992, 1200