General MySQL Oracle SQL Server

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Calculating the Difference between Two Time Values in MySQL
How To Calculate the Difference between Two Time Values in MySQL? 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'), TIME('09:26:50')) FROM DUAL; 10:00:00 SELECT TIMEDIF... 2017-12-26, 3837🔥, 0💬

UPDATE with Subquery Returning No Rows in MySQL
What Happens If the UPDATE Subquery Returns No Rows in MySQL? 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 SET clause. The tutorial exercise below shows you a good exampl... 2018-01-08, 3819🔥, 0💬

PS_THREAD_ID() - PS Thread ID of Given Connect
How to obtain the performance schema thread id of a given connection using the PS_THREAD_ID() function? PS_THREAD_ID(con) is a MySQL built-in function that returns the performance schema thread id of a given connection. For example: SELECT CONNECTION_ID(); -- +-----------------+ -- | CONNECTION_ID()... 2025-02-16, 3740🔥, 0💬

Show Storage Engines Supported in MySQL in MySQL
How To See Which Storage Engines Are Supported in Your MySQL Server in MySQL? If you want to know exactly which storage engines are supported in your MySQL server, you can run the "SHOW ENGINES" command as shown in the tutorial example below: mysql&gt; SHOW ENGINES; +------------+---------+-----. .. 2017-08-08, 3716🔥, 0💬

Requirements for Using MySQL in PHP in MySQL
What Do You Need to Connect PHP to MySQL in MySQL? If you want to access MySQL database server in your PHP script, you need to make sure that a MySQL API module (extension) is installed and turned on in your PHP engine. PHP 5 now supports two MySQL API extensions: mysql - This is the standard MySQL ... 2017-07-30, 3668🔥, 0💬

Removed: ENCODE() - Encoding Data with Password
How to encode a byte sequence with a given password using the ENCODE() function? ENCODE(clear, pass) is a MySQL built-in function that encodes a byte sequence with a given password using the default encoding algorithm. Note that ENCODE() is no longer supported. It was: Introduced MySQL 4.0. Removed ... 2024-10-14, 3639🔥, 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, 3636🔥, 0💬

Transaction Isolation Levels in MySQL
What Are Transaction Isolation Levels in MySQL? There are 4 transaction isolation levels defined by SQL-1992 standard: READ UNCOMMITTED - The SELECT statements in one transaction will read uncommitted data changes from transactions of all connected sessions. In this level, "dirty read" could happen,... 2017-08-03, 3554🔥, 0💬

CURRENT_USER() - Authentication Name of Current User
How to obtain the authentication name of the current user using the CURRENT_USER() function? CURRENT_USER() is a MySQL built-in function that returns the authentication name of the current user. The authentication name is a combination of "User" and "Host" columns in the mysql.user table and used to... 2025-06-18, 3544🔥, 0💬

Testing New User Account and Password in MySQL
How To Test a New User Account and Password in MySQL? If you have new user created with a password, you test it using "mysql" program with the "-u" and "-p" options. The following tutorial exercise shows you some interesting use cases of connecting to the server with user names and passwords: &g... 2017-09-08, 3466🔥, 0💬

Converting Character Strings to Numeric Values in MySQL
How To Convert Character Strings to Numeric Values in MySQL? You can convert character strings to numeric values by using the CAST(string AS DECIMAL) or CAST(string AS SIGNED INTEGER) function as shown in the following examples: SELECT CAST('4123.45700' AS DECIMAL) FROM DUAL; 4123.46 -- Very poor co... 2018-03-28, 3434🔥, 0💬

Running "mysql" Commands from a Batch File in MySQL
How To Run "mysql" Commands from a Batch File in MySQL? If you have group of "mysql" commands that need to be executed repeatedly, you can put them into a file, and run them from the file in "mysql" batch mode. Here is a batch file, \temp\links.sql, contains following commands: USE test; INSERT INTO... 2018-02-08, 3424🔥, 0💬

ROW_COUNT() - Affected Rows from Last DML Statement
How to obtain the affected row count from the last DML statement (INSERT, UPDATE or DELETE) using the ROW_COUNT() function? ROW_COUNT() is a MySQL built-in function that returns the affected row count from the last DML (Data Manipulation Language) statement (INSERT, UPDATE and DELETE). For example: ... 2025-02-16, 3375🔥, 0💬

Show Server Status with "mysqladmin" in MySQL
How To Check Server Status with "mysqladmin" in MySQL? If you want to check the server status by with "mysqladmin", you can following this tutorial example: &gt;cd \mysql\bin &gt;mysqladmin -u root status Uptime: 223 Threads: 1 Questions: 1 Slow queries: 0 Opens: 12 Flush tables: 1 Open tabl... 2018-06-01, 3375🔥, 0💬

Connect to MySQL Server without Port Number in MySQL
How To Connect to a MySQL Server with Default Port Number in MySQL? If you want to connect a MySQL server with default port number, you can use the "mysql_connect($server)" function, where $server is the host name or IP address where the MySQL server is running. If successful, mysql_connect() will r... 2017-07-30, 3368🔥, 0💬

SUM() - Total Value in Group
How to calculate the total value of a field expression in result set groups using the SUM() function? SUM(expr) is a MySQL built-in aggregate function that calculates the total value of a field expression in result set groups. For example: SELECT help_category_id, SUM(help_topic_id), COUNT(help_topi... 2023-12-01, 3359🔥, 0💬

"mysql" Command Line Arguments in MySQL
What Are the "mysql" Command Line Arguments in 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: "mysql databaseName" - Starts "mysql" in in... 2018-04-28, 3358🔥, 0💬

List All Existing Databases in MySQL
How To Get a List of Databases from MySQL Servers in MySQL? 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 list of all available databases on your MySQL... 2017-11-11, 3310🔥, 0💬

Data File for MyISAM Storage Engine in MySQL
Where Table Data Is Stored by the MyISAM Storage Engine in MySQL? By default, MySQL provides \mysql\data directory for all storage engines to store table data. Under \mysql\data directory, each database will have its own subdirectory to store table data. If a new table is created with the MyISAM sto... 2017-09-01, 3310🔥, 0💬

What Is mSQL in MySQL
What Is mSQL in MySQL? Mini SQL (mSQL) is a light weight relational database management system capable of providing rapid access to your data with very little overhead. mSQL is developed by Hughes Technologies Pty Ltd. MySQL was started from mSQL and shared the same API.   ⇒ What Is SQL in MySQL ⇐ ... 2017-07-15, 3283🔥, 0💬

MySQL Functions for Encryption and Compression
Where to find reference information and tutorials on MySQL database functions for Encryption and Compression? I want to know how to use COMPRESS(), ENCRYPT() and other related functions. Here is a collection of reference information and tutorials on MySQL database functions for Encryption and Compre... 2025-03-12, 3250🔥, 0💬

Transaction Roll Back when Session Killed in MySQL
What Happens to the Current Transaction If the Session Is Killed in MySQL? If a session is killed by the DBA, the current transaction in that session will be rolled back and ended. All the database changes made in the current transaction will be removed. This is called an implicit rollback when sess... 2017-08-03, 3225🔥, 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, 3222🔥, 0💬

What Is SQL in MySQL
What Is SQL in MySQL? SQL, SEQUEL (Structured English Query Language), is a language for RDBMS (Relational Database Management Systems). SQL was developed by IBM Corporation.   ⇒ What Is Table in MySQL ⇐ What Is mSQL in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorial... 2017-07-15, 3214🔥, 0💬

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General MySQL Oracle SQL Server