General MySQL Oracle SQL Server

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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, 2066🔥, 0💬

Run SQL*Plus Commands in SQL Developer in Oracle
How To Run SQL*Plus Commands in SQL Developer in Oracle? Most of the time, you only run SQL statements in SQL Worksheet, the SQL statement area. But you can also run some SQL*Plus commands in SQL Worksheet. The example below shows you how to run the DECRIBE command in SQL Developer: Go to SQL Worksh... 2018-10-08, 2056🔥, 0💬

Creating a Large Table with Random Data for Indexes in SQL Server
How To Create a Large Table with Random Data for Index Testing in SQL Server? If you want to see how index can be used to improve data search performance, you have to build some large tables, which requires large amount of random data. This tutorial exercise helps you to build a large table with pur... 2016-11-13, 2055🔥, 0💬

Define DSN with ODBC Manager in Oracle
How To Define a Data Source Name (DSN) in ODBC Manager in Oracle? DSN (Data Source Name) is an ODBC connection identifier for Windows applications. Here is how you can define a DSN on your Windows system: Go to Control Panel. Go to Administrative Tools. Run Data Sources (ODBC). Go to System DSN tab.... 2016-10-15, 2052🔥, 0💬

What Is a Recycle Bin in Oracle
What Is a Recycle Bin in Oracle? Recycle bin is a logical storage to hold the tables that have been dropped from the database, in case it was dropped in error. Tables in recycle bin can be recovered back into database by the Flashback Drop action. Oracle database recycle save the same purpose as the... 2020-10-26, 2049🔥, 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, 2046🔥, 0💬

"SELECT ... INTO" - Creating New Tables With Queries in SQL Server
How to create new tables with "SELECT ... INTO" statements in SQL Server? Let's say you have a table with many data rows, now you want to create a backup copy of this table of all rows or a subset of them, you can use the "SELECT ... INTO" statement. The tutorial script below gives you a good exampl... 2016-11-17, 2045🔥, 0💬

"sys.objects" - Listing All Objects in a Given Schema in SQL Server
How To List All Objects in a Given Schema in SQL Server? If you are wonder what objects are stored in a given schema as an object container, you can use view "sys.objects" to get a list of all objects in a schema. The tutorial exercise shows you how to list all objects in schema "fyi" and "dbo": -- ... 2016-10-22, 2044🔥, 0💬

Create a New Table with SELECT Statements in Oracle
How To Create a New Table by Selecting Rows from Another Table in Oracle? Let's say you have a table with many data rows, now you want to create a backup copy of this table of all rows or a subset of them, you can use the CREATE TABLE...AS SELECT statement to do this. Here is an example script: &... 2020-02-29, 2037🔥, 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, 2036🔥, 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, 2026🔥, 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, 2023🔥, 0💬

Managing Oracle Database Tables
Where to find answers to frequently asked questions on Managing Oracle Database Tables? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Database Tables. Clear answers are provided together with tutorial exercises to help beginners ... 2019-06-11, 2020🔥, 0💬

"DISABLE TRIGGER" - Disabling Triggers in SQL Server
How To Disable Triggers using "DISABLE TRIGGER" in SQL Server? If want to stop the execution of an existing trigger temporarily, you can use the "DISABLE TRIGGER" statement to disable it. The disabled trigger will be kept in the database. If you want to resume the execution of a disabled trigger, yo... 2016-10-24, 2011🔥, 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, 2010🔥, 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, 2009🔥, 0💬

sys.views - List of Existing Views in SQL Server
How To See Existing Views in SQL Server? If you want to know how many views you have created in a database, you use the system view called sys.views to get a list of views defined in the current database. The tutorial exercise shows you how many views in database FyiCenterData: USE FyiCenterData; GO... 2016-11-05, 2006🔥, 0💬

What Causes Index Fragmentation in SQL Server
What Causes Index Fragmentation in SQL Server? Index fragmentation is usually caused by deleting of existing rows or updating existing values of the indexed column. Inserting new rows should not cause any index fragmentation. This tutorial exercise shows you how update statements of 50000 rows on th... 2016-11-08, 2001🔥, 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, 2000🔥, 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, 1998🔥, 0💬

sys.sql_modules - Getting View Definitions Back in SQL Server
How To Get the Definition of a View Out of the SQL Server in SQL Server? If you want get the definition of an existing view back from the SQL Server, you can use the system view called sys.sql_modules, which stores definitions of views and procedures. The sys.sql_modules holds view definitions ident... 2016-11-05, 1996🔥, 0💬

Execution Flow Control Statements in Oracle
What Are the Execution Flow Control Statements in Oracle? PL/SQL supports three groups of execution control statements: IF Statements - Conditionally executes a block of statements. CASE Statements - Selectively executes a block of statements. LOOP Statements - Repeatedly executes a block of stateme... 2019-03-27, 1994🔥, 1💬

"DROP USER" - Deleting a Database User in SQL Server
How To Delete an Existing Database User in SQL Server? If you don't want to keep a database user any more, you should delete the user by using the "DROP USER" statement. This tutorial exercise shows how to delete "Dba_User": -- Login with "sa" USE FyiCenterData; GO DROP USER Dba_User; GO -- List all... 2022-01-24, 1988🔥, 0💬

Data Literals in SQL Server Transact-SQL
Where to find answers to frequently asked questions on data literals in Microsoft SQL Server Transact-SQL? I am new to Transact-SQL and SQL Server. Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on data literals in Microsoft SQL Server Transact-SQL: Con... 2017-05-20, 1987🔥, 0💬

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General MySQL Oracle SQL Server