General MySQL Oracle SQL Server

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NULL Values Involved in Bitwise Operations in SQL Server
What Happens If NULL Values Are Involved in Bitwise Operations in SQL Server Transact-SQL? If NULL values are involved in bitwise operations, the result will be binary NULL values. The following tutorial script shows you some good examples: SELECT 1 | NULL; GO ----------- NULL SELECT 707 &amp; N... 2017-02-03, 2333🔥, 0💬

CREATE TABLE Statement in MySQL
How To Create a New Table in MySQL? If you want to create a new table, you can use the "CREATE TABLE" statement. The following tutorial script shows you how to create a table called "tip": mysql&gt; CREATE TABLE tip (id INTEGER PRIMARY KEY, subject VARCHAR(80) NOT NULL, description VARCHAR(256) ... 2018-03-10, 2332🔥, 0💬

Filter Out Duplications in Returning Rows in Oracle
How To Filter Out Duplications in Returning Rows in Oracle? If there are duplications in the returning rows, and you want to remove the duplications, you can use the keyword DISTINCT or UNIQUE in the SELECT clause. The tutorial exercise below shows you that DISTINCT works on selected columns only: S... 2019-12-19, 2330🔥, 0💬

Inserting Data into an Existing Table in MySQL
How To Insert Data into an Existing Table in MySQL? If you want to insert a row of data into an existing table, you can use the INSERT INTO statement as shown in the following sample script: &lt;?php include "mysql_connection.php"; $sql = "INSERT INTO fyi_links (id, url) VALUES (" . " 101, 'dev.... 2017-10-08, 2330🔥, 0💬

Predefined User Accounts in MySQL
What Are the Predefined User Accounts in MySQL? There is only one predefined user account called "root": "root" was created during the installation process. "root" has no password initially. You need to assign a new password as soon as you finishes the installation. "root" has all access privileges ... 2017-09-08, 2330🔥, 0💬

What Is Oracle SQL Developer in Oracle
What Is Oracle SQL Developer in Oracle? Oracle SQL Developer is a new, free graphical tool that enhances productivity and simplifies database development tasks. With SQL Developer, you can browse database objects, run SQL statements and SQL scripts, and edit and debug PL/SQL statements. You can also... 2019-02-18, 2329🔥, 0💬

What Is a Dead Lock in Oracle
What Is a Dead Lock in Oracle? A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram: (transaction 1) (transaction 2) update row X to create lock 1 update row Y to create lock 2 update row X (bl... 2019-08-08, 2328🔥, 0💬

Work with Data Objects Interactively in Oracle
How To Work with Data Objects Interactively in Oracle? You can work with data objects through SQL statements in statement area. If you want to work with data objects interactively, you should use the object browser. The following tutorial steps help you to browse data objects: Click the Connetions t... 2018-10-08, 2328🔥, 0💬

Writing Date and Time Literals in MySQL
How To Write Date and Time Literals in MySQL? MySQL offers a number of formats for you to use to enter date and time literals: ANSI standard format: "YYYY-MM-DD HH:MM:SS". Non-standard limiters. Like: "YYYY/MM/DD HH^MM^SS" or "YYYY.MM.DD HH-MM-SS". No limiters. Like: "YYYYMMDD" for a date or "HHMMSS... 2017-12-26, 2328🔥, 0💬

Counting Duplicated Values in a Column in MySQL
How To Count Duplicated Values in a Column in MySQL? If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the GROUP BY ... HAVING clause as shown in the following example. It ret... 2017-10-16, 2328🔥, 0💬

Data File of BDB Storage Engine in MySQL
Where Table Data Is Stored by the BDB Storage Engine in MySQL? By default, MySQL provides \mysql\data directory for all storage engines to store table data. Under \mysql\data directory, the BDB storage engine will create one file for each table to store table data and index data. If a new table is c... 2017-08-13, 2328🔥, 0💬

Using SELECT Statements in Views in MySQL
Can SELECT Statements Be Used on Views in MySQL? Select (query) statements can be used on views in the same way as tables. The following tutorial exercise helps you creating a view and running a query statement on the view: mysql&gt; CREATE VIEW myLinks AS SELECT * FROM fyi_links WHERE url LIKE ... 2018-01-06, 2327🔥, 0💬

Shutdown MySQL Server Properly in MySQL
How To Properly Shutdown MySQL Server Daemon mysqld in MySQL? The proper way to shutdown your MySQL server is to the use "mysqladmin shutdown" command. Other ways to shutdown your server include: Enter "mysqladmin -u root -ppassowrd shutdown" command with options in a command window. Use Windows Tas... 2017-12-04, 2326🔥, 0💬

"DROP SCHEMA" - Dropping an Existing Schema in SQL Server
How To Drop an Existing Schema in SQL Server? If you want to delete a schema, you need to move all objects out of that schema, then use the "DROP SCHEMA" statement to delete the schema. The tutorial exercise below shows you how to drop schema "fyi": -- Login with "sa" USE FyiCenterData; GO -- Drop f... 2016-10-20, 2325🔥, 0💬

Define a Procedure inside another Procedure in Oracle
How To Define a Procedure inside Another Procedure in Oracle? Define a procedure inside another procedure is supported by PL/SQL. The following tutorial script shows you an example: SQL&gt; CREATE OR REPLACE PROCEDURE HR.DBA_WEEK AS 2 PROCEDURE DBA_TASK (day VARCHAR2) AS 3 BEGIN 4 IF day = 'MOND... 2019-02-18, 2324🔥, 0💬

Concatenating Character Strings in MySQL
How To Concatenate Two Character Strings in MySQL? If you want concatenate multiple character strings into one, you need to use the CONCAT() function. Here are some good examples: SELECT CONCAT('Welcome',' to') FROM DUAL; Welcome to SELECT CONCAT('FYI','center','.com') FROM DUAL; FYIcenter.com   ⇒ E... 2018-04-07, 2324🔥, 0💬

OUTPUT - Receiving Output Values from Stored Procedures in SQL Server
How To Receive Output Values from Stored Procedures in SQL Server Transact-SQL? If an output parameter is defined in a stored procedure, the execution statement must provide a variable to receive the output value in the format: "@variable_name OUTPUT" or "@parameter_name = @variable_name OUTPUT". Th... 2016-12-28, 2324🔥, 0💬

Performing Comparison on Character Strings in SQL Server
How To Perform Comparison on Character Strings in SQL Server Transact-SQL? Comparison operations on character strings are performed based on the associated collation. Each collation defines rules on how characters are ordered, how character cases and accents are treated, etc. The tutorial exercise b... 2017-01-21, 2323🔥, 0💬

Counting Groups Returned with the GROUP BY Clause in SQL Server
How To Count Groups Returned with the GROUP BY Clause in SQL Server? If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the number of groups, you can put the GROUP BY query i... 2016-10-29, 2322🔥, 0💬

Starting SQL Server Browser Service
How To Start SQL Server Browser Service? SQL Server Browser Service is installed as part of the SQL Server. But it is turned off by default to reduce the security risk. If you want start SQL Server Browser Service to allow the SQL Server to accept network connections, you need to follow the steps be... 2024-07-25, 2321🔥, 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, 2321🔥, 0💬

Close MySQL Connection Objects in MySQL
How To Close MySQL Connection Objects in MySQL? MySQL connection objects created with mysql_connect() calls should be closed as soon as you have finished all of your database access needs by calling mysql_close($con) function. This will reduce the consumption of connection resources on your MySQL se... 2017-11-11, 2321🔥, 0💬

PHP MSSQL - mssql_rows_affected() - Number of Affected Rows
PHP MSSQL - How To Get the Number of Affected Rows? If you insert multiple rows with a single INSERT statement, you can use the mssql_rows_affected() function to find out how many rows were inserted. mssql_rows_affected($connectio n)returns the number of affected rows of the last INSET, UPDATE or DE... 2024-02-28, 2320🔥, 0💬

Turning Off PHP Warning Messages for ODBC Connection
How To Turn Off Warning Messages during PHP Execution? If don't want see warning messages generated from the PHP engine when executing PHP scripts, you can change the error_reporting setting in the php.ini configuration file. Open php.ini and change the following lines: ;error_reporting = E_ALL &... 2024-06-30, 2319🔥, 0💬

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General MySQL Oracle SQL Server