General MySQL Oracle SQL Server

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Error: Cannot Identify/Lock Data File in Oracle
What Happens If You Lost a Data File in Oracle? After you shutting down an Oracle database, you accidently deleted a data file from the operating system. If you try to start the database again you will get error when Oracle tries to open the database after mounting the database. The following tutori... 2019-04-09, 3605🔥, 0💬

Default Collation in SQL Server Transact-SQL
How To Find Out What Is the Default Collation in SQL Server Transact-SQL? The default collation of a database comes from the server if you are not using the COLLATE clause in the CREATE DATABASE statement. If you are not using the COLLATE clause for character string column, it will use the default c... 2017-05-13, 3604🔥, 0💬

Tables Using MEMORY Storage Engine in MySQL
How To Create a New Table Using the MEMORY Storage Engine in MySQL? MEMORY storage engine stores table data in computer system memory. This is good for creating temporary tables. MEMORY is not the default storage engine. You need to specify "ENGINE = MEMORY" at the end of the "CREATE TABLE" statemen... 2017-08-08, 3602🔥, 0💬

Using Old Values to Define New Values in UPDATE Statements in SQL Server
How to use old values to define new values in UPDATE statements in SQL Server? If a row matches the WHERE clause in a UPDATE statement, existing values in this row can be used in expressions to provide new values in the SET clause. Existing values are represented by column names in the expressions. ... 2016-11-02, 3602🔥, 0💬

"CREATE DATABASE" Statement - Creating New Databases in SQL Server
How to create new databases with "CREATE DATABASE" statements in SQL Server? This is the first tutorial of a quick lesson on creating database objects with Transact-SQL statements. This lesson shows you how to create a database, create a table in the database, and then access and change the data in ... 2016-12-02, 3599🔥, 0💬

What Is a Subquery in Oracle
What Is a Subquery in Oracle? 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 eval... 2019-09-27, 3597🔥, 0💬

SQL Server Connection Protocols
What connection protocols are supported by SQL Server? SQL Server supports the following connection protocols: 1. TCP/IP (Transmission Control Protocol/Internet Protocol) - This is the most commonly used protocols to connect to SQL Server databases. It allow client tools or application programs on a... 2024-08-14, 3596🔥, 0💬

Create a Stored Procedure in Oracle
How To Create a Stored Procedure in Oracle? A stored procedure is a procedure with a specified name and stored into the current database. If you want to create a stored procedure, you can use the CREATE PROCEDURE statement. The example script below creates a stored procedure: SQL&gt; CREATE PROC... 2018-11-11, 3596🔥, 0💬

Change Settings in Binary SPFile in Oracle
What To Do If the Binary SPFile Is Wrong for the Default Instance in Oracle? Let's say the SPFile for the default instance is a binary file, and some settings are wrong in the SPFile, like SGA setting is bellow 20MB, how do you change a setting in the binary file? This seems to be a hard task, becau... 2020-09-15, 3595🔥, 0💬

Using Stored Procedures in SQL Server Transact-SQL
Where to find answers to frequently asked questions on Using Stored Procedures in SQL Server Transact-SQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using Stored Procedures in SQL Server Transact-SQL. Clear answers are provided with tutorial... 2017-01-11, 3595🔥, 0💬

Using SELECT Statements on Views in SQL Server
Can SELECT Statements Be Used on Views in SQL Server? 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: CREATE VIEW myLinks AS SELECT * FROM fyi_links WHERE url LIKE '%fyi%' G... 2016-10-26, 3595🔥, 0💬

ALTER TABLE - Add a New Column in Oracle
How To Add a New Column to an Existing Table in Oracle? If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script: SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREA... 2020-02-29, 3592🔥, 0💬

What Is SQL in MySQL
What Is SQL in MySQL? SQL, SEQUEL (Structured English Query Language), is a language for RDBMS (Relational Database Management Systems). SQL was developed by IBM Corporation.   ⇒ What Is Table in MySQL ⇐ What Is mSQL in MySQL ⇑ Database Basics and Terminologies in MySQL ⇑⇑ MySQL Database Tutorial... 2017-07-15, 3592🔥, 0💬

Create an Index for a Given Table in MySQL
How To Create an Index for a Given Table in MySQL? If you have a table with a lots of rows, and you know that one of the columns will be used often as a search criteria, you can add an index for that column to improve the search performance. To add an index, you can use the "CREATE INDEX" statement ... 2018-02-14, 3591🔥, 0💬

What Is a Directory Object in Oracle
What Is a Directory Object in Oracle? A directory object is a logical alias for a physical directory path name on the operating system. Directory objects can be created, dropped, and granted access permissions to different users. The following tutorial exercise shows you some good examples: &gt;... 2016-10-15, 3590🔥, 0💬

Calculating the Difference between Two Dates in MySQL
How To Calculate the Difference between Two Dates in MySQL? If you have two dates, and you want to know how many days between them, you can use the DATEDIFF(date1, date2) function as shown below: SELECT DATEDIFF(DATE('1997-02-28'), DATE('1997-03-01')) FROM DUAL; -1   ⇒ Calculating the Difference bet... 2017-12-26, 3585🔥, 0💬

What Is a Statement in SQL Server Transact-SQL
What is a statement in SQL Server Transact-SQL? A statement in SQL Server Transact-SQL is a single smallest execution unit. Here are some examples of Transact-SQL statements: "PRINT 'Hello World!';" - An output statement that print a character string to the console. "SELECT GETDATE();" - A query sta... 2017-05-29, 3583🔥, 0💬

Create an Initialization Parameter File in Oracle
How To Create an Initialization Parameter File in Oracle? This is Step 3. To run an Oracle database as an Oracle instance, you need to create an initialization parameter file, which contains a set of initialization parameters. The easiest way to create an initialization parameter file to copy from t... 2019-04-03, 3582🔥, 0💬

Rules on Arithmetic Operations in SQL Server
What Are Arithmetic Operators in SQL Server Transact-SQL? An arithmetic operator performs an arithmetic operation on two expressions of numeric data types. SQL Server supports 5 arithmetic operators: + (Add): Addition - (Subtract): Subtraction * (Multiply): Multiplication / (Divide): Division % (Mod... 2017-04-01, 3582🔥, 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, 3575🔥, 0💬

Use LIKE Conditions in Oracle
How To Use LIKE Conditions in Oracle? LIKE condition is also called pattern patch. There 3 main rules on using LIKE condition: '_' is used in the pattern to match any one character. '%' is used in the pattern to match any zero or more characters. ESCAPE clause is used to provide the escape character... 2020-03-15, 3573🔥, 0💬

Converting DATETIME and NUMERIC Values in SQL Server
Are DATETIME and NUMERIC Values Convertible in SQL Server Transact-SQL? Are datetime and numeric value convertible? The answer is yes. Here are the main rules on DATATIME and NUMERIC value conversions: During the conversion a DATETIME value will be treated as a NUMERIC value with the number of days ... 2017-02-22, 3572🔥, 0💬

JSON_SCHEMA_VALIDATION_REPORT() - JSON Schema Validation Report
How to generate a validation report of a JSON value against a JSON schema using the JSON_SCHEMA_VALIDATION_REPORT( )function? JSON_SCHEMA_VALIDATION_REPORT( schema,json) is a MySQL built-in function that returns a validation report of a JSON value against a given JSON schema. The report itself is a ... 2024-11-23, 3568🔥, 0💬

Start the Default Instance in Oracle
How To Use "startup" Command to Start Default Instance in Oracle? If you logged in to the server as a SYSDBA, you start the default instance with the "startup" command. Here is how to start the default instance in SQL*Plus in SYSDBA mode: &gt;.\bin\sqlplus Enter user-name: SYSTEM/fyicenter AS SY... 2020-09-15, 3568🔥, 0💬

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General MySQL Oracle SQL Server