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How To Use Subqueries with the EXISTS Operator
How To Use Subqueries with the EXISTS Operator? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries A subquery can be used with the EXISTS operator as "EXISTS (subquery)", which returns true if the subquery returns one or more rows. The following statement is a good example of "EXISTS (sub... 2007-05-11, 6030👍, 0💬

How To Query Tables and Loop through the Returning Rows
How To Query Tables and Loop through the Returning Rows? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts The best way to query tables and loop through the returning rows is to run the SELECT statement with the mysql_query() function, catch the returning object as a result set, an... 2007-05-11, 6016👍, 0💬

What Is Commit
What Is Commit? - MySQL FAQs - Database Basics and Terminologies Commit is a way to terminate a transaction with all database changes to be saved permanently to the database server. 2007-05-10, 5992👍, 0💬

How To Include Numeric Values in SQL statements
How To Include Numeric Values in SQL statements? - MySQL FAQs - Introduction to SQL Basics If you want to include a numeric value in your SQL statement, you can enter it directly as shown in the following examples: SELECT 255 FROM DUAL; -- An integer 255 SELECT -6.34 FROM DUAL; -- A regular number -... 2007-05-11, 5974👍, 0💬

How To Add a New User Account
How To Add a New User Account? - MySQL FAQs - Managing User Accounts and Access Privileges If you want to add a new user account, you can connect to the server as "root" and use the "CREATE USER ..." command. The command syntax for create a new user account with a specified user name and password is... 2007-05-10, 5957👍, 0💬

What Is Table
What Is Table? - MySQL FAQs - Database Basics and Terminologies A table is a data storage structure with rows and columns. 2007-05-10, 5955👍, 0💬

Can one issue DDL statements from Forms?
Can one issue DDL statements from Forms? DDL (Data Definition Language) commands like CREATE, DROP and ALTER are not directly supported from Forms because your Forms are not suppose to manipulate the database structure. A statement like CREATE TABLE X (A DATE); will result in error: Encountered the ... 2011-04-05, 5953👍, 0💬

How Does MySQL Handle Read Consistency
How Does MySQL Handle Read Consistency? - MySQL FAQs - Transaction Management: Commit or Rollback Read consistency is a concept that describes how consistent the output will be on two subsequent read operations. A read operation is usually a stand alone SELECT statement or a SELECT subquery in a par... 2007-05-11, 5901👍, 0💬

How To Count Groups Returned with the GROUP BY Clause
How To Count Groups Returned with the GROUP BY Clause? - MySQL FAQs - SQL SELECT Statements with JOIN and Subqueries If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the nu... 2007-05-11, 5899👍, 0💬

How Long a Transaction Will Wait for a Data Lock
How Long a Transaction Will Wait for a Data Lock? - MySQL FAQs - Transaction Management: Commit or Rollback If you issue a UPDATE or DELETE statement on a row that has an exclusive lock owned by another session, your statement will be blocked to wait for the other session to release the lock. But th... 2007-05-11, 5884👍, 0💬

What Are the "mysql" Command Line Arguments
What Are the "mysql" Command Line Arguments? - MySQL FAQs - Command-Line End User Interface mysql "mysql" supports only one optional command line argument, "database". But "mysql" allows the operating system to redirect input and output streams at the command line level. Here are some good examples:... 2007-05-10, 5871👍, 0💬

What Is ISAM
What Is ISAM? - MySQL FAQs - Database Basics and Terminologies ISAM (Indexed Sequential Access Method) was developed by IBM to store and retrieve data on secondary storage systems like tapes. 2007-05-10, 5869👍, 0💬

How To Create a Table for Transaction Testing
How To Create a Table for Transaction Testing? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to learn transaction management, you should create a table with the InnoDB storage engine. The default storage engine MyISAM does not support the transaction concept. The tutorial exe... 2007-05-11, 5866👍, 0💬

How To Get a List of Databases from MySQL Servers
How To Get a List of Databases from MySQL Servers? - MySQL FAQs - PHP Connections and Query Execution Once you got a MySQL server connection object successfully, you need to know what databases are available on the server and which database you should use to manage your tables and data. To get a lis... 2007-05-10, 5852👍, 0💬

How To End the Current Transaction
How To End the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback There are several ways the current transaction can be ended implicitly or explicitly: In "Autocommit On" mode, a single-statement transaction will be ended implicitly when the execution of the statement end... 2007-05-11, 5848👍, 0💬

How To Omit Columns with Default Values in INSERT Statement
How To Omit Columns with Default Values in INSERT Statement? - MySQL FAQs - Understanding SQL INSERT, UPDATE and DELETE Statements If you don't want to specify values for columns that have default values, or you want to specify values to columns in an order different than how they are defined, you c... 2007-05-11, 5846👍, 0💬

How To Quote Text Values in SQL Statements
How To Quote Text Values in SQL Statements? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts Text values in SQL statements should be quoted with single quotes ('). If the text value contains a single quote ('), it should be protected by replacing it with two single quotes (''). In... 2007-05-11, 5796👍, 0💬

How To Delete Existing Rows in a Table
How To Delete Existing Rows in a Table? - MySQL FAQs - Managing Tables and Running Queries with PHP Scripts If you want to remove a row from a table, you can use the DELETE statement with a WHERE clause to identify the row. The following sample script deletes one row: &lt;?php include "mysql_con... 2007-05-11, 5771👍, 0💬

How To Sort Output in Descending Order
How To Sort Output in Descending Order? - MySQL FAQs - SQL SELECT Query Statements with GROUP BY If you want to sort a column in descending order, you can specify the DESC keyword in the ORDER BY clause. The following SELECT statement first sorts the "tag" in descending order, then sorts the "counts... 2007-05-11, 5769👍, 0💬

What Is a Dead Lock
What Is a Dead Lock? - MySQL FAQs - Transaction Management: Commit or Rollback A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram: (transaction 1) (transaction 2) update row X to create lock ... 2007-05-09, 5764👍, 0💬

How To Convert Dates to Character Strings
How To Convert Dates to Character Strings? - MySQL FAQs - Introduction to SQL Date and Time Handling You can convert dates to character strings using the DATE_FORMAT(date, format) function. MySQL supports the following basic formatting codes: %a Abbreviated weekday name (Sun..Sat) %b Abbreviated mon... 2007-05-11, 5732👍, 0💬

What Is CSV
What Is CSV? - MySQL FAQs - Database Basics and Terminologies CSV (Comma Separated Values) is a file format used to store database table contents, where one table row is stored as one line in the file, and each data field is separated with comma. 2007-05-10, 5732👍, 0💬

Can Group Functions Be Mixed with Non-group Selection Fields
Can Group Functions Be Mixed with Non-group Selection Fields? - MySQL FAQs - SQL SELECT Query Statements with GROUP BY If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. Th... 2007-05-11, 5731👍, 0💬

How To Rollback the Current Transaction
How To Rollback the Current Transaction? - MySQL FAQs - Transaction Management: Commit or Rollback If you have used some DML statements updated some data objects, you find a problem with those updates, and you don't want those updates to be permanently recorded in the database, you can use the ROLLB... 2007-05-11, 5728👍, 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