General MySQL Oracle SQL Server

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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, 2387🔥, 0💬

What Is InnoDB in MySQL
What Is InnoDB in MySQL? InnoDB is a transaction safe storage engine developed by Innobase Oy (an Oracle company now).   ⇒ What Is BDB in MySQL ⇐ What Is MyISAM in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorials 2017-07-03, 2386🔥, 0💬

Moving Database Physical Files to New Locations in SQL Server
How to move database physical files in SQL Server? If you want to move database physical files to a new location, you can use the "ALTER DATABASE" statements to bring the database offline, and link it to the files at the new location. The following tutorial gives you a good example: ALTER DATABASE F... 2016-11-20, 2386🔥, 0💬

Tables Using InnoDB Storage Engine in MySQL
How To Create a New Table Using the InnoDB Storage Engine in MySQL? InnoDB storage engine was developed by Innobase Oy, which is an Oracle company now. InnoDB is transaction safe, and has been used by a number of large Websites, like Slashdot.org. InnoDB is not the default storage engine. You need t... 2017-09-01, 2385🔥, 0💬

Use Subqueries in the FROM Clause in Oracle
How To Use Subqueries in the FROM Clause in Oracle? If you have a query returning many rows of data, and you want to perform another query on those rows, you can put the first query as a subquery in the FROM clause of the second query. The following statement shows you how to use a subquery as base ... 2019-09-27, 2384🔥, 0💬

Differences of CHAR and NCHAR in SQL Server Transact-SQL
What Are the Differences between CHAR and NCHAR in SQL Server Transact-SQL? Both CHAR and NCHAR are fixed length data types in Transact-SQL. But they have the following main differences: CHAR stores characters based on the code page with 1 byte per character most of the time. NCHAR stores characters... 2017-04-04, 2383🔥, 0💬

What Is Oracle Server Autotrace in Oracle
What Is Oracle Server Autotrace in Oracle? Autotrace is Oracle server feature that generates two statement execution reports very useful for performance tuning: Statement execution path - Shows you the execution loop logic of a DML statement. Statement execution statistics - Shows you various execut... 2020-06-08, 2382🔥, 0💬

Insert a RECORD into a Table in Oracle
How To Insert a RECORD into a Table in Oracle? If you have a RECORD variable with data fields matching a table structure, you can insert a row to this table with this RECORD variable using the INSERT statement as shown in the example below: CREATE TABLE emp_temp AS SELECT * FROM employees; CREATE OR... 2018-08-14, 2382🔥, 0💬

Deleting All Rows in a Table in MySQL
How To Delete All Rows in a Table in MySQL? If you want to delete all rows from a table, you have two options: Use the DELETE statement with no WHERE clause. Use the TRUNCATE TABLE statement. The TRUNCATE statement is more efficient the DELETE statement. The tutorial exercise shows you a good exampl... 2018-01-08, 2382🔥, 0💬

Creating Databases with Specified Physical Files in SQL Server
How to create database with physical files specified in SQL Server? If you don't like the default behavior of the CREATE DATABASE statement, you can specify the physical database files with a longer statement: CREATE DATABASE database_name ON (NAME = logical_data_name, FILENAME = physical_data_name,... 2016-11-24, 2382🔥, 0💬

What Are Cursors in SQL Server
What Are Cursors in SQL Server Transact-SQL? A cursor is a special data type that represents a result set returned by a SELECT query statement. There are several notes about cursor you need to remember: Cursor data type can not be used to define table columns. Cursor data type is used on store proce... 2016-10-17, 2381🔥, 0💬

Numeric Comparison Operations in Oracle
What Are the Numeric Comparison Operations in Oracle? PL/SQL supports 6 basic numeric comparison operations as shown in the following sample script: PROCEDURE proc_comparison AS res BOOLEAN; BEGIN res := 1 = 2; res := 1 &lt; 2; res := 1 &gt; 2; res := 1 &lt;= 2; res := 1 &gt;= 2; res... 2018-08-06, 2380🔥, 0💬

Converting Integers into Date and Time Values in SQL Server
Can Integers Be Converted into Date and Time Values in SQL Server Transact-SQL? Can integers be converted into date and time values? The answer is yes. The input integer will be used as the number of days relative to the base date: Jan 1, 1900. The time of the day will be set to 0, midnight of the d... 2017-02-22, 2380🔥, 0💬

Syntaxes of Creating Table-Valued Functions in SQL Server
How Many Ways to Create Table-Valued Functions in SQL Server Transact-SQL? SQL Server supports two syntaxes of creating table-valued functions: 1. Inline Table-valued Functions - A table-valued function created with a single SELECT statement: CREATE FUNCTION function_name( @parameter_1 data_type, @p... 2016-12-18, 2380🔥, 0💬

Retrieve Data from an Explicit Cursor in Oracle
How To Retrieve Data from an Explicit Cursor in Oracle? If you have a cursor opened ready to use, you can use the FETCH ... INTO statement to retrieve data from the cursor into variables. FETCH statement will: Retrieve all the fields from the row pointed by the current cursor pointer and assign them... 2018-07-22, 2377🔥, 0💬

Use an Explicit Cursor without OPEN Statements in Oracle
How To Use an Explicit Cursor without OPEN Statements in Oracle? If you want to open a cursor and loop through its data rows in quick way, you can use the FOR ... IN ... LOOP statement in the same way as the implicit cursor. The following tutorial exercise gives you a good example: CREATE OR REPLACE... 2018-04-07, 2377🔥, 0💬

What Is a Subquery in MySQL
What Is a Subquery in MySQL? A subquery is a SELECT statement used as part of the selection criteria of the main SELECT statement. The subquery specified in the WHERE clause will be evaluated repeated on each row of the selection base table. The output of the subquery will be used in the final evalu... 2017-09-17, 2377🔥, 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, 2377🔥, 0💬

Concatenating Two Character Strings in SQL Server
How To Concatenate Two Character Strings Together in SQL Server Transact-SQL? Concatenating two character strings together is most commonly used string operation. SQL Server 2005 allows to concatenate two character strings into a single string with the (+) operator. The following tutorial exercise s... 2017-03-11, 2377🔥, 0💬

Define a Data Field as NOT NULL in Oracle
How To Define a Data Field as NOT NULL in Oracle? When defining a specific RECORD type, you can define a data field as NOT NULL to make sure variables with this RECORD type to always have values in this field. A field defined as NOT NULL must have a default value. Here is a tutorial script showing y... 2018-09-01, 2376🔥, 0💬

Entering Date and Time Values in SQL Server
How To Enter Date and Time values in SQL Server Transact-SQL? Transact-SQL does not support date and time literals. If you want to enter date and time values, you have to use character string literals and rely implicit casting rules to convert them into date and time values. When casting character s... 2017-04-15, 2376🔥, 0💬

What Is an External Table in Oracle
What Is an External Table in Oracle? An external table is a table defined in the database with data stored outside the database. Data of an external table is stored in files on the operating systems. Accessing data of external tables are done through data access drivers. Currently, Oracle supports t... 2016-11-27, 2376🔥, 0💬

Creating and Managing Triggers in SQL Server
Where to find answers to frequently asked questions on Creating and Managing Triggers in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Creating and Managing Triggers in SQL Server. Clear explanations and tutorial exercises are provid... 2016-10-25, 2376🔥, 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, 2375🔥, 0💬

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General MySQL Oracle SQL Server