Datetime Null

Today found that the deder MYSQL time field, are used `senddata` int (10) unsigned NOT NULL DEFAULT '0'; Then find this article online, it seems that if the time field is involved in the operation, int better, a To retrieve the field without conversion operations, directly for time comparison! Second, the efficiency is higher as described below. In the final analysis: int instead of the data type, more efficient. Environment: Windows XP PHP Versio ...

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The concatenation (join) and segmentation (split) of MSSQL strings are often used by masters using select number from Master. spt_values WHERE type = ' P ', this is a good way to do it, but there are only 2048 digits, and the statement is too long and not convenient. In short, a digital assistance table (100,000 or 1 million per person needs), you deserve it. 2. Useful index of the calendar table: ★★★☆☆ "SQL Programming Style" a book suggests an enterprise ...

Http://www.aliyun.com/zixun/aggregation/11208.html ">microsoft Office Access (formerly known as Microsoft Access) is a relational database management system published by Microsoft. Combined with the Microsoft Jet Database Engine and graphical user interface features, it is one of the members of Microsoft Office. ...

PHP Ads Click Statistics Code, last night there are several IDC network to work with this site to put some ads, but I want to see the effect of advertising after the write a simple advertising statistics code, here is only the statistics can not IP restrictions or nausea click and so on. First, create the database. CREATE TABLE IF not EXISTS ' ad_count ' (' ad_id ' int (8) Not NULL auto_increment, ' Ad_h ...

When you develop a Web site using the Entity Framework in. Net 3.5, you encounter a problem: When you add a record, you cannot use the default value of the database for datetime-type data. 　　The specific situation is this, my database has a users table, three fields, Id,username,createtime. ID is int type, since growth, primary key username is Nvchar (10) type, not allowed to be empty createtime is da ...

HBase and SOLR can make requests to solr through a coprocessor coprocessor, and SOLR can synchronize the data that is received: adding, deleting, and indexing operations.     Store and index on different machines, this is a large data architecture must be, but there are many students do not know this way, they are very new to this idea, however, this is definitely a good direction, so do not know how to study. One of my friends left my blog.

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The database holds one or more tables. Create a Database The CREATE DATABASE statement is used to create a database in MySQL. Syntax CREATE DATABASE database_name In order for PHP to execute the above statement, we must use the mysql_query () function. This function is used to send queries or commands to the MySQL connection. Example In the following example, we create a database named "my_db": ...