General MySQL Oracle SQL Server

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Query Multiple Tables Jointly in MySQL
How To Query Multiple Tables Jointly in MySQL? If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile, "forums" for forums information, and ... 2017-06-23, 2709🔥, 0💬

Introduction to Date and Time Handling in MySQL
Where to find answers to frequently asked questions on Introduction to Date and Time Handling in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Introduction to Date and Time Handling in MySQL. Clear answers are provided with tutorial exerc... 2021-08-04, 2697🔥, 2💬

💬 2021-03-13 Strain John: Hey, u gave us good information. It is easy to understand for everyone and also having good content. I appreciated your afforts ...

Change Transaction Isolation Level in MySQL
How To View and Change the Current Transaction Isolation Level in MySQL? If you want to view or change the current transaction isolation level, you can use the following commands: SELECT @@TX_ISOLATION FROM DUAL; -- Viewing the current transaction isolation level. SET TRANSACTION ISOLATION LEVEL lev... 2017-08-08, 2630🔥, 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, 2555🔥, 0💬

Locks, Timeouts, and Deadlocks in MySQL
What Are Impacts on Applications from Locks, Timeouts, and DeadLocks in MySQL? If you are using transactions with REPEATABLE READ isolation level and transaction safe storage engines in your applications, data locks, lock timeouts, and dead lock detections will impact your application in a concurren... 2017-07-21, 2525🔥, 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, 2510🔥, 0💬

Scope Levels of User Privileges in MySQL
How Many Scope Levels Can User Privileges Apply in MySQL? MySQL supports 5 scope levels a user privilege can be granted: Global Level - A privilege granted at this level applies to all databases on the server. Privileges granted at the global level stored in "mysql.user" table. Database Level - A pr... 2017-12-09, 2498🔥, 0💬

Shutdown the Server with "mysqladmin" Command in MySQL
How To Shut Down the Server with "mysqladmin" in MySQL? If you want to shut down the server with "mysqladmin", you can use the command "mysqladmin shutdown" as shown in the following tutorial example: &gt;cd \mysql\bin &gt;mysqladmin -u root shutdown If this command returns no messages, your... 2018-06-01, 2488🔥, 0💬

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, 2406🔥, 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, 2308🔥, 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, 2211🔥, 0💬

Escape Special Characters in MySQL
How To Escape Special Characters in SQL statements in MySQL? There are a number of special characters that needs to be escaped (protected), if you want to include them in a character string. Here are some basic character escaping rules: The escape character (\) needs to be escaped as (\\). The singl... 2018-04-12, 2198🔥, 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, 2197🔥, 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, 2148🔥, 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, 2097🔥, 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, 2076🔥, 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, 2061🔥, 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, 2018🔥, 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, 2011🔥, 0💬

UPDATE Using Data from Other Tables in MySQL
How To Use Values from Other Tables in UPDATE Statements in MySQL? If you want to update values in one table with values from another table, you can use a subquery as an expression in the SET clause. The subquery should return only one row for each row in the update table that matches the WHERE clau... 2018-01-13, 2008🔥, 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, 1967🔥, 0💬

Show All Columns of an Existing Table in MySQL
How To Get a List of Columns in an Existing Table in MySQL? If you have an existing table, but you don't remember what are the columns used in the table, you can use the "SHOW COLUMNS FROM tableName" command to get a list of all columns of the specified table. You can also use the "DESCRIBE tableNam... 2018-03-10, 1946🔥, 0💬

Analyze Tables with "mysqlcheck" Command in MySQL
How To Analyze Tables with "mysqlcheck" in MySQL? If you want analyze tables with "mysqlcheck", you need to use the "--analyze" option. The following tutorial exercise shows you how to analyze all tables in "mysql" database: &gt;cd \mysql\bin &gt;mysqlcheck -u root --analyze mysql mysql.colu... 2018-02-28, 1921🔥, 0💬

What Is Union in MySQL
What Is Union in MySQL? Join is data retrieval operation that combines multiple query outputs of the same structure into a single output.   ⇒ What Is ISAM in MySQL ⇐ What Is Join in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-07, 1921🔥, 0💬

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General MySQL Oracle SQL Server