10 recommended articles about famous watches

There is a question about the sql left join. Why are all nulls found instead of no data? domain is the domain name table, domain_sell is the listed domain name table, domain_auction_history is the domain name auction table. This is my query statement: SELECT d.,s.,MAX(h.price) AS max_price FROM domain d LEFT JOIN domain_sell s USING(domain_id) LEFT JOIN domain_auction_history h USING(domain_id) WHERE d.status IN('Already on the shelves', 'Under Auction')

1. There is a question about the sql left connection, why are all null found, and No data?

Introduction: domain is the domain name table, domain_sell is the listed domain name table, domain_auction_history is the domain name auction table. This is my query statement: SELECT d.,s.,MAX(h.price) AS max_price FROM domain d LEFT JOIN domain_sell s USING(domain_id) LEFT JO...

2. Friendly links Check the code for php to implement home page link query and friendly link check

Introduction: Friendly link check: Friendly link check PHP implements the code for home page link query and friendly link check: Copy the code and the code is as follows ; ="check"){ $domain=$_POST['domain']; //If the domain name form item is empty, get the address bar parameters if($domain==""){ $domain=$_GET

3. Object Model PHP 50 Object Model Deep Exploration of Static Members like

Introduction: Object Model: Object Model PHP 50 Object Static members like model deep exploration: Static properties contain data to be encapsulated in a class and can be shared by all instances of the class. In fact, in addition to belonging to a fixed class and restricting access methods, the static properties of a class are very similar to the global variables of a function. ​We use a static property Counter::$count in the following example. It belongs to the Counter class and not to any instance of Counter. You cannot use this to refer to it, but you can use self or other valid naming expressions. In the example, the getCount method returns self::$count instead of

4. Phased summary of project research Phased summary of good php code style

Introduction: Phased summary of project research: Phased summary of project research Phased summary of good PHP code style: This article summarizes the style of PHP good code and shares it with everyone for your reference. The details are as follows : 1. Avoid using the magic number if($age<18){}. I don’t quite understand why this 18 is like this. You can define 28 in a variable. The name of this variable indicates the meaning of this value. $adult_age = 18; //The cut-off point age of adulthood if ($age<$adult_age){} 2. The return result of the function: Do not use a Variables to store the return result Once you know the return result, you should return it immediately. This is good

5. PHP file upload performance - multiple file upload

##Introduction: PHP file upload function - multi-file upload This section mainly introduces the multi-file upload function of PHP upload files. As long as the file upload tag in the form is named in the form of an array, multiple files can be uploaded simultaneously. Let's take a look at an example:--------------------------------------------- --------------------------

6. How Submit js inserted row data

Introduction: How to submit js inserted row data I wrote a dynamically inserted row using js, each field is input, and the entire table is It's in the form, and I use post to submit it, but it seems like it can't be submitted. How to get the value of each input in the js inserted row? ------Solution--------------------Form controls with the same name should be named in array ------Solution------ --------------

##7.

The case problem of library name and table name is the startup configuration method compatible with sqlserver

Introduction: The case problem of library name and table name is a startup configuration method compatible with sqlserver. Friends in need can refer to it.

8. Solving the problem of case-sensitive table names under mysql

Introduction: Solving the problem of case-sensitive table names under mysqlMySQL After installation in Linux using rpm mode, the default is: database name and table name. Table alias variable names are strictly case-sensitive 1. Log in with the root account, add lower_case_table_names=1 after [mysqld] in /etc/mysql/my.cnf Operation command: vi /etc/my.cnf [mysqld]## * Basic S

##9. Oracle renames table space and deletes table space

Introduction: If necessary, the name of the table space can be modified. Modifying the name of the table space will not affect the data in the table space. But the system table space system and sysa cannot be modified

##10.

Open source ETL tool kettle--data migration

Introduction: Background Due to the needs of the project, the data needs to be migrated from Oracle to MSSQL. It is not a simple data copy, but the table structure and field names are different, and even need Handle the situation of inconsistent coding specifications, as shown in the figure below. Note: The field names of tables with the same name in Oracle and MSSQL are different. If you use manual SQL statements to operate, it will be very troublesome. You need

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