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Key Word Search in Tables in MySQL
How To Perform Key Word Search in Tables in MySQL? The simplest way to perform key word search is to use the SELECT statement with a LIKE operator in the WHERE clause. The LIKE operator allows you to match a text field with a keyword pattern specified as '%keyword%', where (%) represents any number ...
2017-06-23, 620👍, 0💬

Entering Characters as HEX Numbers in MySQL
How To Enter Characters as HEX Numbers in MySQL? If you want to enter characters as HEX numbers, you can quote HEX numbers with single quotes and a prefix of (X), or just prefix HEX numbers with (0x). A HEX number string will be automatically converted into a character string, if the expression cont...
2018-03-31, 619👍, 0💬

What Is Binary Log File in MySQL
What Is Binary Log File in MySQL? 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 logs only records statements that are changin...
2017-11-29, 619👍, 0💬

List Table Names with "mysqlshow" Command in MySQL
How To Show Table Names with "mysqlshow" in MySQL? If you want to show table names with "mysqlshow", you need to specify a database name. The followings tutorial exercise shows you how to get all table names that match a pattern: If you want analyze tables with "mysqlcheck", you need to use the "--a...
2018-05-19, 618👍, 0💬

What Is TIMESTAMP Data Type in MySQL
What Is TIMESTAMP Data Type in MySQL? A TIMESTAMP data type allows you to record a date and time like DATETIME data type. But it has some interesting features when used on a table column: The first TIMESTAMP column in a table will be assigned with the current date and time, if it is not listed in an...
2018-03-13, 618👍, 0💬

Decrementing a Date by 1 in MySQL
How To Decrement Dates by 1 in MySQL? If you have a date, and you want to decrement it by 1 day, you can use the DATE_SUB(date, INTERVAL 1 DAY) function. You can also use the date interval subtraction operation as "date - INTERVAL 1 DAY". The tutorial exercise below gives you some good examples: SEL...
2017-12-26, 618👍, 0💬

Database Basics and Terminologies in MySQL
Where to find answers to frequently asked questions on Database Basics and Terminologies in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Database Basics and Terminologies in MySQL to help you review your knowledge. A short answer is prov...
2017-07-21, 618👍, 0💬

Drop an Existing Index in MySQL
How To Drop an Existing Index in MySQL? If you don't need an existing index any more, you should delete it with the "DROP INDEX indexName ON tableName" statement. Here is an example SQL script: mysql&gt; DROP INDEX tip_subject ON tip; Query OK, 0 rows affected (0.13 sec) Records: 0 Duplicates: 0...
2018-02-14, 617👍, 0💬

PHP Connections and Query Execution for MySQL
Where to find answers to frequently asked questions on PHP Connections and Query Execution for MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on PHP Connections and Query Execution in MySQL. Clear explanations and tutorial exercises are provi...
2017-11-25, 617👍, 0💬

Violation of Unique Value Constraint in MySQL
What Happens If Unique Value Constraints Are Violated in MySQL? If you are inserting a new record that has values violating a unique constraint, you will get an error. Note that primary key column has a unique value constraint by default. The following tutorial exercise gives you some good examples:...
2018-01-16, 616👍, 0💬

Failed to Create a Database in MySQL
What Happens If You Do Not Have Privileges to Create Database in MySQL? If your MySQL server is provided by your Internet service company, your user account will most likely have no privilege to create new databases on the server. In that case, your CREATE DATABASE statement will fail. Here is an ex...
2017-11-11, 616👍, 0💬

Evaluating Expressions with SELECT Statements in MySQL
How To Calculate Expressions with SELECT Statements in MySQL? There is no special SQL statements to calculate expressions. But you can use the "SELECT expression FROM DUAL" statement return the calculated value of an expression. "DUAL" is a dummy table in the server. The tutorial exercise below show...
2018-04-12, 615👍, 0💬

CREATE Command Denied Error in MySQL
What Happens If You No CREATE Privilege in a Database in MySQL? In order to create tables in a database, your user account must have the CREATE privilege for that database. Otherwise you will get an error as shown in the following tutorial exercise: &gt;cd \mysql\bin &gt;mysql -u guest -ppub...
2018-03-10, 615👍, 0💬

What Is "mysqldump" Command in MySQL
What Is "mysqldump" in MySQL? "mysqldump" - A command-line interface for administrators or end users to export data from the server to files. Here are some sample commands supported by "mysqldump": "mysqldump databaseName tableName" - Dumps the specified table in the specified database. "mysqldump d...
2018-05-19, 614👍, 0💬

Turn on Binary Logs in MySQL
How To Turn on Binary Logs in MySQL? 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: &gt;cd \mysql\bin &gt;mkdir \mysql\logs &gt...
2017-11-29, 614👍, 0💬

Using Subqueries with the EXISTS Operator in MySQL
How To Use Subqueries with the EXISTS Operator in MySQL? 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 (subquery)". It returns rows from fyi_links table that th...
2017-09-17, 614👍, 0💬

Date and Time Intervals in MySQL
What Are Date and Time Intervals in MySQL? A date and time interval is special value to be used to increment or decrement a date or a time at a given date or time unit. A data and time interval should be expression in the format of "INTERVAL expression unit", where "unit" and "expression" should fol...
2017-12-26, 613👍, 0💬

What Is RollBack in MySQL
What Is Rollback in MySQL? Rollback is a way to terminate a transaction with all database changes not saving to the database server.   ⇒Database Basics and Terminologies in MySQL ⇒⇒MySQL Database Tutorials
2016-10-16, 613👍, 0💬

Ways to Get the Current Time in MySQL
How Many Ways to Get the Current Time in MySQL? There are 8 ways to get the current time: SELECT NOW() FROM DUAL; 2006-07-01 10:02:41 SELECT CURRENT_TIME() FROM DUAL; 10:02:58 SELECT SYSDATE() FROM DUAL; 2006-07-01 10:03:21 mysql&gt; SELECT CURRENT_TIMESTAMP() FROM DUAL; 2006-07-01 10:04:03 SELE...
2018-03-13, 612👍, 0💬

Inner Join with the WHERE Clause in MySQL
How To Write an Inner Join with the WHERE Clause in MySQL? 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&gt; SELECT l.id, l.url, r.comment FROM fyi_links l, fyi_rates...
2017-09-28, 612👍, 0💬

Use Existing Column Values in the SET Clause in MySQL
How To Use Existing Column Values in the SET Clause in MySQL? If a row matches the WHERE clause in a UPDATE statement, existing values in this row can be used in expressions to provide new values in the SET clause. Existing values are represented by column names in the expressions. The tutorial exer...
2018-01-13, 610👍, 0💬

What Are User Privileges in MySQL
What Are User Privileges in MySQL? MySQL offers many user privileges to control user accesses to different functions and data objects. Here are some commonly used privileges: ALL - All privileges. CREATE - Allows the user to use CREATE TABLE commands. ALTER - Allows the user to use ALTER TABLE comma...
2017-12-09, 610👍, 0💬

Adding a New User Account in MySQL
How To Add a New User Account in MySQL? 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: CREATE USER userName IDENTIFIED BY 'passwordStrin...
2017-09-08, 609👍, 0💬

MySQL Server Features in MySQL
What Is MySQL in MySQL? 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, and Tcl are available. Fully multi-threaded using ...
2018-06-12, 608👍, 0💬

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