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What Is Column
What Is Column? - MySQL FAQs - Database Basics and Terminologies A column defines one piece of data stored in all rows of the table. 2007-05-10, 5584👍, 0💬

How To Sort the Query Output
How To Sort the Query Output? - MySQL FAQs - SQL SELECT Query Statements with GROUP BY If you want the returning rows to be sorted, you can specify a sorting expression in the ORDER BY clause. The simplest sort expression is column name who's values will be sorted by. The following select statement ... 2007-05-11, 5579👍, 0💬

What Is Binary Log File
What Is Binary Log File? - MySQL FAQs - Server Daemon mysqld Administration MySQL server binary log file plays an important role in restoring database changes to the server. Main features on binary log files are: Binary logs can be turned on by "--log-bin=fileBaseName" option on "mysqld". Binary log... 2007-05-11, 5571👍, 0💬

How To Find Out the Current Transaction Mode
How To Find Out the Current Transaction Mode? - MySQL FAQs - Transaction Management: Commit or Rollback If you are not sure about your current transaction mode, you can use the "SELECT @@AUTOCOMMIT FROM DUAL" statement to find out as shown in the following tutorial exercise: >\mysql\bin\mysql -u dev... 2007-05-11, 5553👍, 0💬

Can Multiple Columns Be Used in GROUP BY
Can Multiple Columns Be Used in GROUP BY? - MySQL FAQs - SQL SELECT Query Statements with GROUP BY If you want to break your output into smaller groups, if you specify multiple column names or expressions in the GROUP BY clause. Output in each group must satisfy a specific combination of the express... 2007-05-11, 5545👍, 0💬

How To Use UNION to Merge Outputs from Two Queries Together
How To Use UNION to Merge Outputs from Two Queries Together? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries If you have two queries that returns the same row fields, you can merge their outputs together with the UNION operator. The following tutorial exercise shows you how to return a... 2007-05-11, 5544👍, 0💬

How To Write an Inner Join with the WHERE Clause
How To Write an Inner Join with the WHERE Clause? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries If you don't want to use the INNER JOIN ... ON clause to write an inner join, you can put the join condition in the WHERE clause as shown in the following query example: mysql> SELECT l.id... 2007-05-11, 5536👍, 0💬

How To Fix the INSERT Command Denied Error
How To Fix the INSERT Command Denied Error? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts The reason for getting the "1142: INSERT command denied" error is that your user accound does not have the INSERT privilege on the table or database. To resolve this error, you need to ask... 2007-05-10, 5536👍, 0💬

How To Get the ID Column Auto-Incremented
How To Get the ID Column Auto-Incremented? - PHP Script Tips - Working with MySQL Database Many tables require an ID column to assign a unique ID number for each row in the table. For example, if you have a table to hold forum member profiles, you need an ID number to identify each member. To allow ... 2007-04-14, 5529👍, 0💬

How To Count Duplicated Values in a Column
How To Count Duplicated Values in a Column? - MySQL FAQs - SQL SELECT Query Statements with GROUP BY If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the GROUP BY ... HAVING ... 2007-05-11, 5527👍, 0💬

How To Get the Number of Rows Selected or Affected by a SQL Statement
How To Get the Number of Rows Selected or Affected by a SQL Statement? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts There are two functions you can use the get the number of rows selected or affected by a SQL statement: mysql_num_rows($res) - Returns the number of rows selecte... 2007-05-10, 5506👍, 0💬

How To Calculate the Difference between Two Time Values
How To Calculate the Difference between Two Time Values? - MySQL FAQs - Introduction to SQL Date and Time Handling If you have two time values, and you want to know the time difference between them, you can use the TIMEDIFF(time1, time2) function as shown below: SELECT TIMEDIFF(TIME('19:26:50'), TIM... 2007-05-11, 5503👍, 0💬

How To Commit the Current Transaction
How To Commit the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback If you have used some DML statements updated some data objects, and you want to have the updates to be permanently recorded in the database, you can use the COMMIT command. It will make all the database ... 2007-05-11, 5500👍, 0💬

What Are the Differences between CHAR and NCHAR
What Are the Differences between CHAR and NCHAR? - MySQL FAQs - Introduction to SQL Basics Both CHAR and NCHAR are fixed length string data types. But they have the following differences: CHAR's full name is CHARACTER. NCHAR's full name is NATIONAL CHARACTER. By default, CHAR uses ASCII character se... 2007-05-11, 5495👍, 0💬

How To Connect to MySQL Severs with User Accounts
How To Connect to MySQL Severs with User Accounts? - MySQL FAQs - PHP Connections and Query Execution If you want to connect a MySQL server with user account name and password, you need to call mysql_connect() with more parameters like this: $con = mysql_connect($server, $username, $password); If yo... 2007-05-10, 5495👍, 0💬

What Is MySQL
What Is MySQL? - MySQL FAQs - Downloading and Installing MySQL on Windows MySQL is an open source database management system developed by MySQL AB, http://www.mysql.com. MySQL has the following main features: Works on many different platforms. APIs for C, C++, Eiffel, Java, Perl, PHP, Python, Ruby, ... 2007-05-10, 5482👍, 0💬

How To Include Character Strings in SQL statements
How To Include Character Strings in SQL statements? - MySQL FAQs - Introduction to SQL Basics If you want to include character strings in your SQL statements, you need to quote them in one of the following formats: Using single quotes. For example 'FYIcenter.com'. Using double quotes. For example "F... 2007-05-11, 5473👍, 0💬

What Is "mysqlcheck"
What Is "mysqlcheck"? - MySQL FAQs - Administrator Tools for Managing MySQL Server "mysqlcheck" is a command-line interface for administrators to check and repair tables. Here are some sample commands supported by "mysqlcheck": "mysqlcheck databaseName tableName" - Checks the specified table in the ... 2007-05-11, 5472👍, 0💬

What Is View
What Is View? - MySQL FAQs - Database Basics and Terminologies A view is a logical table defined by a query statement. 2007-05-10, 5468👍, 0💬

What Happens If the UPDATE Subquery Returns No Rows
What Happens If the UPDATE Subquery Returns No Rows? - MySQL FAQs - Understanding SQL INSERT, UPDATE and DELETE Statements If you use a subquery to assign new values in the SET clause in an UPDATE statement, and the subquery returns no rows for an outer row, MySQL will provide a NULL value to the SE... 2007-05-11, 5461👍, 0💬

What Is Row
What Is Row? - MySQL FAQs - Database Basics and Terminologies A row is a unit of data with related data items stored as one item in one column in a table. 2007-05-10, 5458👍, 0💬

What Is a Subquery
What Is a Subquery? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries A subquery is a SELECT statement used as part of the selection criteria of the main SELECT statement. The subquery specified in the WHERE clause will be evaluated repeated on each row of the selection base table. The o... 2007-05-11, 5453👍, 0💬

How To Turn on Binary Logs
How To Turn on Binary Logs? - MySQL FAQs - Server Daemon mysqld Administration If you want MySQL to write binary logs to a file, you can use the "--log-bin=fileBaseName" option at the "mysqld" command line. The tutorial exercise below shows you a good example on how to use this option: >cd \mysql\bi... 2007-05-11, 5451👍, 0💬

How To Experiment Dead Locks
How To Experiment Dead Locks? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to have some experience with dead locks, you can create two windows running two mysql transactions in two sessions at the REPEATABLE READ transaction isolation level. Then run some UPDATE statements a... 2007-05-09, 5443👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML