General MySQL Oracle SQL Server

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Unicode Character Data Types in SQL Server Transact-SQL
What are Unicode character string data types supported in SQL Server Transact-SQL? Unicode character string data types are used to hold Unicode character strings. There are 3 Unicode character string data types supported in SQL Server Transact-SQL: 1. NCHAR (or NATIONAL CHAR, or NATIONAL CHARACTER) ... 2017-04-08, 3332🔥, 0💬

Database Table: Rows of Columns in Oracle
What Is a Database Table in Oracle? A database table is a basic unit of data logical storage in an Oracle database. Data is stored in rows and columns. You define a table with a table name, such as employees, and a set of columns. You give each column a column name, such as employee_id, last_name, a... 2019-06-01, 3326🔥, 0💬

Set Up Breakpoints in Debug Mode in Oracle
How To Set Up Breakpoints in Debug Mode in Oracle? To debug a stored procedure, you need to set breakpoints at different statements in the code block, so that execution will be stopped at the statement marked with a breakpoint. When execution is stopped, you can then investigate different variables ... 2018-12-26, 3325🔥, 0💬

What Is a Server Parameter File in Oracle
What Is a Server Parameter File in Oracle? A server parameter file is a binary file that acts as a repository for initialization parameters. The server parameter file can reside on the machine where the Oracle database server executes. Initialization parameters stored in a server parameter file are ... 2020-07-07, 3320🔥, 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, 3319🔥, 0💬

What Is NULL Value in Oracle
What Is NULL Value in Oracle? NULL is a special value representing "no value" in all data types. NULL can be used on in operations like other values. But most operations has special rules when NULL is involved. The tutorial exercise below shows you some examples: SET NULL 'NULL'; -- Make sure NULL i... 2019-12-02, 3318🔥, 0💬

User_Name() - Database Level Security Principal of Your Session in SQL Server
What Is the Security Principal at the Database Level That Represents Your Session in SQL Server? Security principal identifies who you are when you interact with the SQL Server. What can do you at the database solely depends on the security principal that represents you. So it is very important to k... 2016-10-20, 3310🔥, 0💬

What Is Oracle Database 10g Express Edition in Oracle
What Is Oracle Database 10g Express Edition in Oracle? Based on Oracle Web site: Oracle Database 10g Express Edition (Oracle Database XE) is an entry-level, small-footprint database based on the Oracle Database 10g Release 2 code base that's free to develop, deploy, and distribute; fast to download;... 2020-05-15, 3309🔥, 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, 3309🔥, 0💬

Versions of SQL Server Transact-SQL
How do I tell what version of Transact-SQL my SQL Server is using? The Transact-SQL version is the same as the SQL Server. You can determine the SQL Server version using the following Transact-SQL statement: SELECT @@version ------------------------------ ------------------------------ ------------Mi... 2017-06-16, 3304🔥, 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, 3303🔥, 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, 3294🔥, 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, 3286🔥, 0💬

EXECUTE - Executing Stored Procedures in SQL Server
How To Execute a Stored Procedure in SQL Server Transact-SQL? If you want execute a stored procedure created previously, you can use the EXECUTE statement in the following formats: EXEC procedure_name; EXECUTE procedure_name; The key word EXEC is actually optional. So you can execute a stored proced... 2017-01-05, 3281🔥, 0💬

Generating CREATE PROCEDURE Scripts on Existing Stored Procedures in SQL Server
How To Generate CREATE PROCEDURE Script on an Existing Stored Procedure in SQL Server Transact-SQL? If you want to know how an existing stored procedure was created, you can use SQL Server Management Studio to automatically generate a "CREATE PROCEDURE" script The following tutorial shows you how to... 2017-01-05, 3281🔥, 0💬

Selecting Some Specific Columns from a Table in SQL Server
How To Select Some Specific Columns from a Table in a Query in SQL Server? If you want explicitly tell the query to return some specific columns, you can specify the column names in the SELECT clause. The following select statement returns only three columns, "id", "created" and "url" from the table... 2016-10-26, 3280🔥, 0💬

Create an Array in PL/SQL in Oracle
How To Create an Array in PL/SQL in Oracle? If you want create an array data structure, you can use the collection type VARRAY. VARRAY stands for Variable Array. Here is a sample script on how to use VARRAY: SQL&gt; set serveroutput on; SQL&gt; DECLARE 2 TYPE list IS VARRAY(3) OF VARCHAR(16)... 2019-03-08, 3273🔥, 0💬

What Are Named Parameters in Oracle
What Are Named Parameters in Oracle? Named parameters are actual parameters specified not by position but by providing formal parameter names when calling the procedure or function. The main advantage of named parameters is that the caller don't have to remember the position of each parameter. But t... 2018-10-13, 3273🔥, 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, 3273🔥, 0💬

sys.triggers - Listing All Triggers in the Database in SQL Server
How To List All Triggers in the Database with sys.triggers in SQL Server? If you want to list all triggers defined in the current database, you can use the catalog view, sys.triggers, as shown in the following tutorial example: USE FyiCenterData; GO CREATE TRIGGER new_user ON fyi_users AFTER INSERT ... 2016-10-25, 3271🔥, 0💬

Insert Multiple Rows with 1 INSERT Statement in Oracle
How To Insert Multiple Rows with One INSERT Statement in Oracle? If you want to insert multiple rows with a single INSERT statement, you can use a subquery instead of the VALUES clause. Rows returned from the subquery will be inserted the target table. The following tutorial exercise gives a good ex... 2020-01-29, 3266🔥, 0💬

Load Data with SQL*Loader in Oracle
How To Load Data with SQL*Loader in Oracle? Let's say you have a table defined as: CREATE TABLE student (id NUMBER(5) PRIMARY KEY, first_name VARCHAR(80) NOT NULL, last_name VARCHAR(80) NOT NULL, birth_date DATE NOT NULL, social_number VARCHAR(80) UNIQUE NOT NULL); There is an input data file stored... 2016-11-27, 3259🔥, 0💬

Limitations of Oracle Database 10g XE in Oracle
What Are the Limitations of Oracle Database 10g XE in Oracle? Oracle Database XE is free for runtime usage with the following limitations: Supports up to 4GB of user data (in addition to Oracle system data) Single instance only of Oracle Database XE on any server May be installed on a multiple CPU s... 2020-05-05, 3254🔥, 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, 3254🔥, 0💬

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General MySQL Oracle SQL Server