General MySQL Oracle SQL Server

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List of Data Types in SQL Server Transact-SQL
How many data types supported in SQL Server Transact-SQL? I want a list of all data types. Here is a list of all Transact-SQL data types divided into 6 categories: 1. Exact Number - Used to hold numeric values truncated to a specific precision and scale. BIGINT - Used to hold big integers. INT (or I... 2017-04-22, 3273🔥, 0💬

Execute a Simple Stored Procedure in Oracle
How To Execute a Stored Program Unit in Oracle? If you want to execute a stored program unit, you can use the EXECUTE statement. The example script below shows how to executes a stored program unit: SQL&gt; set serveroutput on; SQL&gt; CREATE PROCEDURE Hello AS 2 BEGIN 3 DBMS_OUTPUT.PUT_LINE... 2019-03-20, 3272🔥, 0💬

Oracle SQL Developer Written in Java in Oracle
Is Oracel SQL Developer written in Java in Oracle? Oracel SQL Developer is written in Java. It requires JDK 1.5, which is already included in your download file.   ⇒ Connect to Local 10g XE Server in Oracle ⇐ Start Oracle SQL Developer in Oracle ⇑ Introduction to Oracle SQL Developer ⇑⇑ Oracle Dat... 2019-02-05, 3272🔥, 0💬

Oracle SQL Developer Written in Java in Oracle
Is Oracel SQL Developer written in Java in Oracle? Oracel SQL Developer is written in Java. It requires JDK 1.5, which is already included in your download file.   ⇒ Connect to Local 10g XE Server in Oracle ⇐ Start Oracle SQL Developer in Oracle ⇑ Introduction to Oracle SQL Developer ⇑⇑ Oracle Dat... 2019-02-05, 3272🔥, 0💬

Open and Close an Explicit Cursor in Oracle
How To Open and Close an Explicit Cursor in Oracle? An existing cursor can be opened or closed by the OPEN or CLOSE statement as shown in the following sample script: DECLARE CURSOR c_list IS SELECT * FROM countries; CURSOR t_list IS SELECT * FROM employees WHERE employee_id = 100; BEGIN OPEN c_list... 2018-07-22, 3270🔥, 0💬

Using SELECT Statements and GROUP BY Clauses in SQL Server
Where to find answers to frequently asked questions on Using SELECT Statements and GROUP BY Clauses in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using SELECT Statements and GROUP BY Clauses in SQL Server. Clear answers are provid... 2016-10-26, 3270🔥, 0💬

Pass a Cursor Variable to a Procedure in Oracle
How To Pass a Cursor Variable to a Procedure in Oracle? A cursor variable can be passed into a procedure like a normal variable. The sample script below gives you a good example: CREATE OR REPLACE PROCEDURE FYI_CENTER AS sys_cur SYS_REFCURSOR; PROCEDURE emp_print(cur SYS_REFCURSOR) AS emp_rec employ... 2018-07-18, 3269🔥, 0💬

Failed to Create a Database in MySQL
What Happens If You Do Not Have Privileges to Create Database in MySQL? If your MySQL server is provided by your Internet service company, your user account will most likely have no privilege to create new databases on the server. In that case, your CREATE DATABASE statement will fail. Here is an ex... 2017-11-11, 3269🔥, 0💬

Creating User Defined Functions with Parameters in SQL Server
How To Create User Defined Functions with Parameters in SQL Server Transact-SQL? Very often, you need to create a function with one or more parameters so that the function can be more generic. You only supply values to those parameters at the time of executing the function. User defined functions wi... 2016-12-18, 3269🔥, 0💬

What Is a Data Lock in Oracle
What Is a Data Lock in Oracle? A data lock is logical flag the Oracle server is placed on data objects to give an exclusive right to a transaction. Statements in other transactions needs to respect data locks based on certain rules. Rules on data locks are: SELECT query statements do not create any ... 2019-08-19, 3268🔥, 0💬

Ways to End the Current Transaction in MySQL
How To End the Current Transaction in MySQL? There are several ways the current transaction can be ended implicitly or explicitly: In "Autocommit On" mode, a single-statement transaction will be ended implicitly when the execution of the statement ends. Changes will be committed. Running the COMMIT ... 2016-10-17, 3268🔥, 0💬

Triggers with Multiple Affected Rows in SQL Server
What Happens to a Trigger with Multiple Affected Rows in SQL Server? If there is only one row affected by a DML statement, we know that the DML trigger will be executed once. But how many times the DML trigger will be executed if the DML statement resulted multiple affected rows? The answer is still... 2016-10-24, 3267🔥, 0💬

PL/SQL Functions in Oracle
What Is a Function in Oracle? A function is a named program unit. It consists of three parts: Declaration Part - Defining the function name, calling parameters, return value type, local variables and local procedures. Declaration part is required. Execution Part - Defining execution logic with execu... 2018-11-29, 3266🔥, 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, 3266🔥, 0💬

Managing Databases and Physical Files in SQL Server
Where to find answers to frequently asked questions on Managing Databases and Physical Files in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Databases and Physical Files in SQL Server. Clear answers are provided with tutori... 2016-11-24, 3266🔥, 0💬

Character String Functions Supported by SQL Server 2005 in SQL Server
What Are the Character String Functions Supported by SQL Server 2005 in SQL Server Transact-SQL? SQL Server 2005 supports 23 character string functions: ASCII(char) - Returning the code value of a non-Unicode character. CHAR(int) - Returning the non-Unicode character of a code value. CHARINDEX(word,... 2017-03-07, 3263🔥, 0💬

"CREATE LOGIN" - Creating a New Login Name in SQL Server
How To Create a New Login Name in SQL Server in SQL Server? In previous tutorials, it is assumed that you use the "sa" (System Administrator) login name to connect to your SQL Server. But that is not what a normal developer uses to connect to the server, since "sa" has the ALL permissions granted. Y... 2016-10-20, 3263🔥, 0💬

Repair MyISAM Tables in MySQL
How To Check and Repair MyISAM Tables in MySQL? If you have a corrupted MyISAM table, like the one resulted from the previous tutorial exercise, you can use the "CHECK TABLE" and "REPAIR TABLE" commands to try to repair it. The following tutorial exercise gives you a good example of repairing a corr... 2017-09-01, 3261🔥, 0💬

Turn on Error Logs in MySQL
How To Turn on Error Logs in MySQL? If you want MySQL to write critical errors into a log file, you can use the "--log-error=fileName" option at the "mysqld" command line. The tutorial exercise below shows you a good example on how to use this option: &gt;cd \mysql\bin &gt;mkdir \mysql\logs ... 2017-11-29, 3260🔥, 0💬

MS SQL Server DBA Checklist - General DBA Best Practices
-- Join (or start) a local SQL Server users group -- Attend at least one professional conference each year. -- Attend at least one training session each year. -- Read at least four books on SQL Server each year. -- Read the free e-book, How to Become an Exceptional DBA -- Learn everything you can ab... 2022-01-24, 3259🔥, 0💬

Invoke Built-in Functions in PL/SQL in Oracle
How To Invoke Built-in Functions in PL/SQL in Oracle? Of course, you can invoke SQL functions in SQL statements. But many SQL functions can also be executed in regular PL/SQL statements, as shown in the following sample script: DECLARE now DATE; id NUMBER; str VARCHAR2(40); BEGIN now := SYSDATE; DBM... 2018-09-13, 3259🔥, 0💬

Logical Operations in PL/SQL in Oracle
What Are the Logical Operations in Oracle? PL/SQL supports 3 logical operations as shown in the following sample script: PROCEDURE proc_comparison AS x BOOLEAN := TRUE; y BOOLEAN := FALSE; res BOOLEAN; BEGIN res = x AND y; res = x OR y; res = NOT x; -- more statements END;   ⇒ Categories of Data Typ... 2018-08-06, 3259🔥, 0💬

Date and Time Differences in Oracle
How To Calculate Date and Time Differences in Oracle? If you want to know how many years, months, days and seconds are there between two dates or times, you can use the date and time interval expressions: YEAR ... TO MONTH and DAY ... TO SECOND. The tutorial exercise below gives you some good exampl... 2020-03-15, 3258🔥, 0💬

Drop a Tablespace in Oracle
How To Drop a Tablespace in Oracle? If you have an existing tablespace and you don't want it anymore. You can delete a tablespace by using the DROP TABLESPACE statement as shown in the example below: SQL&gt; CREATE TABLESPACE my_space 2 DATAFILE '/temp/my_space.dbf' SIZE 10M; Tablespace created.... 2019-04-13, 3258🔥, 0💬

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General MySQL Oracle SQL Server