General MySQL Oracle SQL Server

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Experiment with Data Locks in MySQL
How To Experiment Data Locks in MySQL? If you want to have some experience with data locks, you can create two windows running two mysql transactions in two sessions. In session 1, you can run a UPDATE statement with REPEATABLE READ transaction isolation level to create an exclusive lock. Before com... 2017-04-28, 2671🔥, 0💬

Using IN Conditions in MySQL
How To Use IN Conditions in MySQL? An IN condition is single value again a list of values. It returns TRUE, if the specified value is in the list. Otherwise, it returns FALSE. Some examples are given in the tutorial exercise below: SELECT 3 IN (1,2,3,4,5) FROM DUAL; 1 SELECT 3 NOT IN (1,2,3,4,5) FRO... 2018-03-28, 2670🔥, 0💬

What Is Table in MySQL
What Is Table in MySQL? A table is a data storage structure with rows and columns.   ⇒ What Is Column in MySQL ⇐ What Is SQL in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-15, 2666🔥, 0💬

SELECT Statements with JOIN and Subqueries in MySQL
Where to find answers to frequently asked questions on SELECT Statements with JOIN and Subqueries in MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SELECT Statements with JOIN and Subqueries in MySQL. Clear answers are provided with tutori... 2017-12-31, 2665🔥, 0💬

Using CASE Expression in MySQL
How To Use CASE Expression in MySQL? There are 2 ways to use the CASE expression. The first way is to return one of the predefined values based on the comparison of a given value to a list of target values. The second way is to return one of the predefined values based on a list of conditions. Here ... 2018-03-24, 2664🔥, 0💬

Use "mysql" to Run SQL Statements in MySQL
How To Use "mysql" to Run SQL Statements in MySQL? If you want to run SQL statement to your server with "mysql", you need to start "mysql" and enter your SQL statement at the "mysql" prompt. Here is a good tutorial exercise that shows you how to run two SQL statements with "mysql": &gt;cd \mysql... 2018-02-28, 2661🔥, 0💬

Numeric Data Types in MySQL
What Are Numeric Data Types in MySQL? MySQL supports the following numeric data types: BIT(n) - An integer with n bits. BOOL same as BOOLEAN - Boolean values stored in 1 bit. TINYINT - A small integer stored in 1 byte. SMALLINT - A small integer stored in 2 bytes. MEDIUMINT - A medium integer stored... 2018-01-19, 2661🔥, 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, 2660🔥, 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, 2659🔥, 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, 2657🔥, 0💬

What Are DDL Statements in MySQL
What Are DDL Statements in MySQL? DDL (Data Definition Language) statements are statements to create and manage data objects in the database. The are 3 primary DDL statements: CREATE - Creating a new database object. ALTER - Altering the definition of an existing data object. DROP - Dropping an exis... 2018-03-10, 2653🔥, 0💬

JSON_SCHEMA_VALIDATION_REPORT() - JSON Schema Validation Report
How to generate a validation report of a JSON value against a JSON schema using the JSON_SCHEMA_VALIDATION_REPORT( )function? JSON_SCHEMA_VALIDATION_REPORT( schema,json) is a MySQL built-in function that returns a validation report of a JSON value against a given JSON schema. The report itself is a ... 2024-11-23, 2651🔥, 0💬

Count Number of Rows with SELECT Statements in MySQL
How To Use SELECT Statement to Count Number of Rows in MySQL? If you want to count the number of rows, you can use the COUNT(*) function in the SELECT clause. The following tutorial exercise shows you some good example: mysql&gt; SELECT COUNT(*) FROM fyi_links; +----------+ | COUNT(*) | +-------... 2018-01-06, 2647🔥, 0💬

Drop an Existing View in MySQL
How To Drop an Existing View in MySQL? If you have an existing view, and you don't want it anymore, you can delete it by using the "DROP VIEW viewName" statement as shown in the following script: mysql&gt; DROP VIEW faqComment; Query OK, 0 rows affected (0.00 sec) mysql&gt; SELECT * FROM faq... 2018-01-24, 2646🔥, 0💬

What Is Row in MySQL
What Is Row in MySQL? A row is a unit of data with related data items stored as one item in one column in a table.   ⇒ What Is Primary key in MySQL ⇐ What Is Column in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-15, 2646🔥, 0💬

What Is Primary key in MySQL
What Is Primary Key in MySQL? A primary key is a single column or multiple columns defined to have unique values that can be used as row identifications.   ⇒ What Is Foreign Key in MySQL ⇐ What Is Row in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-07, 2646🔥, 0💬

Selecting an Existing Database in MySQL
How To Select an Exiting Database in MySQL? The first thing after you have created a connection object to the MySQL server is to select the database where your tables are located, by using the mysql_select_db() function. If your MySQL server is offered by your Web hosting company, they will assign a... 2017-10-23, 2639🔥, 0💬

Show All Indexes of a given Table in MySQL
How To Get a List of Indexes of a Given Table in MySQL? If you want to see the index you have just created for an existing table, you can use the "SHOW INDEX FROM tableName" command to get a list of all indexes in a given table. The tutorial script below shows you a nice example: mysql&gt; SHOW ... 2018-02-14, 2638🔥, 0💬

Viewing User Privileges in MySQL
How To View User Privileges in MySQL? If a regular user wants to see his/her own granted privileges, he/she can use the "SHOW GRANTS" command. If the "root" user wants to see other user's granted privileges, he/she can use the "SHOW GRANTS FOR userName" command. The following tutorial exercise shows... 2017-08-21, 2636🔥, 0💬

Transaction Roll Back when Session Ended in MySQL
What Happens to the Current Transaction If the Session Is Ended in MySQL? If a session is ended, 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 session is ended.... 2017-08-03, 2636🔥, 0💬

Major Storage Engines Supported in MySQL in MySQL
What Are Storage Engines in MySQL? Storage engines are programs that are integrated into MySQL database management system to manage data tables. MySQL 5.0 supports the following major storage engines: MyISAM Storage Engine - MySQL default storage engine. Based on ISAM database concept. MyISAM is not... 2017-09-12, 2634🔥, 0💬

JSON_TYPE() - Detecting Type of JSON Value
How to detect the type of a JSON (JavaScript Object Notation) value using the JSON_TYPE() function? JSON_TYPE(json) is a MySQL built-in function that returns the data type of a JSON (JavaScript Object Notation) value. For example: SELECT JSON_TYPE('[]'), JSON_TYPE('{}'); -- +-----------------+------... 2025-03-12, 2632🔥, 0💬

Build WHERE Criteria with Web Form Data in MySQL
How To Build WHERE Criteria with Web Form Search Fields in MySQL? If your PHP script is linked to a Web form which takes search key words for multiple data fields. For example, your Web form asks your visitor to search for Website links with a URL search field, a Website title search field, a descri... 2017-06-23, 2632🔥, 0💬

Create an Index for a Given Table in MySQL
How To Create an Index for a Given Table in MySQL? If you have a table with a lots of rows, and you know that one of the columns will be used often as a search criteria, you can add an index for that column to improve the search performance. To add an index, you can use the "CREATE INDEX" statement ... 2018-02-14, 2631🔥, 0💬

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General MySQL Oracle SQL Server