General MySQL Oracle SQL Server

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Concatenate Two Text Values in Oracle
How To Concatenate Two Text Values in Oracle? There are two ways to concatenate two text values together: CONCAT() function. '||' operation. Here is some examples on how to use them: SELECT 'FYI' || 'Center' || '.com' FROM DUAL; FYICenter.com SELECT CONCAT('FYICenter','.com') FROM DUAL; FYICenter.co... 2019-12-02, 3342🔥, 0💬

Differences between INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND in Oracle
What Are the Differences between INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND in Oracle? The main differences between INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND are: INTERVAL YEAR TO MONTH stores values as time intervals at the month level. INTERVAL DAY TO SECOND stores values as time in... 2020-04-25, 3340🔥, 0💬

Managing Oracle Tablespaces and Data Files
Where to find answers to frequently asked questions on Managing Oracle Tablespaces and Data Files? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Oracle Tablespaces and Data Files. Clear answers are provided with tutorial exercises on cr... 2019-04-17, 3334🔥, 0💬

"ALTER AUTHORIZATION" - Changing the Ownership of a Schema in SQL Server
How To Change the Ownership of a Schema in SQL Server? If you want to change the owner of a schema, you can use the "ALTER AUTHORIZATION" statement using the following syntax: ALTER AUTHORIZATION ON SCHEMA::schema_name TO user_name The following tutorial example shows you how to change ownership of ... 2016-10-22, 3332🔥, 0💬

Quickest Way to Export Data to a Flat File in Oracle
What Is the Quickest Way to Export a Table to a Flat File in Oracle? The quickest way to export a table to a flat file is probably to use the SQL*Plus SPOOL command. It allows you to record SELECT query result to a text file on the operating system. The following tutorial exercise shows you how cont... 2018-06-27, 3331🔥, 0💬

Create a Test Table for Transaction Testing in Oracle
How To Create a Test Table for Transaction Testing in Oracle? If you want to practice DML statements, you should create a testing table as shown in the script below: &gt;cd (OracleXE home directory) &gt;.\bin\sqlplus /nolog SQL&gt; connect HR/fyicenter Connected. SQL&gt; CREATE TABLE... 2019-09-04, 3327🔥, 0💬

Setting New Values to Parts of a DATETIME Value in SQL Server
How To Set Different Parts of a DATETIME Value in SQL Server Transact-SQL? In SQL Server, you can get different parts of a DATETIME value with the DATEPART() functions. But there is no function that allows you to set different parts to a DATETIME value. For example, you a date_of_birth column as DAT... 2017-02-08, 3322🔥, 0💬

Disk Space Needed for an Export Job in Oracle
How To Estimate Disk Space Needed for an Export Job in Oracle? If you just want to know how much disk space for the dump without actually exporting any data, you can use the ESTIMATE_ONLY=y parameter on the expdp command. The following tutorial exercise shows you how a system user wants to see the d... 2016-10-15, 3317🔥, 0💬

ONLINE/OFFLINE - Database States in SQL Server
What are database states in SQL Server? A database is always in one specific state. For example, these states include ONLINE, OFFLINE, or SUSPECT. To verify the current state of a database, select the state_desc column in the sys.databases catalog view. The following table defines the database state... 2016-11-20, 3314🔥, 0💬

Understanding SQL Language Basics for Oracle
Where to find answers to frequently asked questions on SQL Language Basics for Oracle? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on SQL Language Basics for Oracle. Clear answers are provided with tutorial exercises on data types, data literals,... 2020-05-29, 3310🔥, 0💬

Transaction Roll Back when Session Killed in MySQL
What Happens to the Current Transaction If the Session Is Killed in MySQL? If a session is killed by the DBA, 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 sess... 2017-08-03, 3310🔥, 0💬

Return Top 5 Rows in Oracle
How To Return Top 5 Rows in Oracle? If you want the query to return only the first 5 rows, you can use the pseudo column called ROWNUM in the WHERE clause. ROWNUM contains the row number of each returning row from the query. The following statement returns the first 5 rows from the employees table: ... 2019-09-16, 3309🔥, 0💬

Improving the Trigger to Handle NULL Values in SQL Server
How To Improve the Trigger to Handle NULL Values in SQL Server? When a NULL value is concatenated with a string, the result will be a null value. So if you want the trigger to properly report NULL values, you need to enhance the trigger as shown in the following tutorial example: USE FyiCenterData; ... 2016-10-24, 3306🔥, 0💬

What Is an Initialization Parameter File in Oracle
What Is an Initialization Parameter File in Oracle? An initialization parameter file is a text file that contains a list of initialization parameters. The file should be written in the client's default character set. Sample initialization parameter files are provided on the Oracle distribution mediu... 2020-07-07, 3302🔥, 0💬

Creating Oracle PL/SQL Procedures and Functions
Where to find answers to frequently asked questions on Creating Oracle PL/SQL Procedures and Functions? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Creating Oracle PL/SQL Procedures and Functions. It can also be used as learning tutorials on c... 2018-01-27, 3296🔥, 0💬

"RIGHT OUTER JOIN ... ON" - Writing Queries with Right Outer Joins in SQL Server
How To Write a Query with a Right Outer Join in SQL Server? If you want to query from two tables with a right outer join, you can use the RIGHT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a right outer join from two tables: fyi_links and fyi_rates. The join c... 2016-10-30, 3295🔥, 0💬

Privilege to Create Views in Oracle
What Privilege Is Needed for a User to Create Views in Oracle? To be able to create views in a user's own schema, the user needs to have the CREATE VIEW privilege, or the CREATE ANY VIEW privilege, which is more powerful, and allows the user to create views in other user's schema. The following tuto... 2019-06-29, 3294🔥, 0💬

Variable Names Collide with Column Names in Oracle
What Happens If Variable Names Collide with Table/Column Names in Oracle? When a variable name collides with a column name, PL/SQL will use it as the variable if it is used where variable is allowed; It will be used as the column, if it is used where variable is not allowed but column is allowed. He... 2018-09-24, 3293🔥, 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, 3293🔥, 0💬

Export Data to an XML File in Oracle
How To Export Data to an XML File in Oracle? If you want to export data from a table to a file in XML format, you can use the following steps: Right-click the table name, EMPLOYEES, in the object tree view. Select Export. Select XML. The Export Data window shows up. Click Format tab. Select Format a... 2019-01-12, 3287🔥, 0💬

IS_IPV4() - Detecting IPv4 Address
How to detect an IPv4 Address using the IS_IPV4() function? IS_IPV4(ip) is a MySQL built-in function that returns 1 if the given value is a valid IPv4 address, 0 otherwise. For example: SELECT IS_IPV4('10.0.5.9'), IS_IPV4('10.0.5.256'); -- +---------------------+------- ----------------+-- | IS_IPV4... 2026-02-02, 3277🔥, 0💬

DML (Data Manipulation Language_Statements in SQL Server
What Are DML (Data Manipulation Language) Statements in SQL Server? DML (Data Manipulation Language) statements are statements to change data values in database tables. The are 3 primary DML statements: INSERT - Inserting new rows into database tables. For example "INSERT INTO fyi_links VALUES (101,... 2016-11-03, 3276🔥, 0💬

"sp_help" - Getting a List of Columns in a View in SQL Server
How To Get a List of Columns in a View using the "sp_help" Stored Procedure in SQL Server? Another way to get a list of columns from a view is to use the "sp_help" stored procedure. "sp_help" returns more than just a list of columns. It returns: the view information, the column information, the iden... 2016-11-05, 3270🔥, 0💬

"LEFT OUTER JOIN ... ON" - Writing Queries with Left Outer Joins in SQL Server
How To Write a Query with a Left Outer Join in SQL Server? If you want to query from two tables with a left outer join, you can use the LEFT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a left outer join from two tables: fyi_links and fyi_rates. The join condi... 2016-10-30, 3270🔥, 0💬

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General MySQL Oracle SQL Server