General MySQL Oracle SQL Server

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What Is "mysqlcheck" Command in MySQL
What Is "mysqlcheck" in MySQL? "mysqlcheck" is a command-line interface for administrators to check and repair tables. Here are some sample commands supported by "mysqlcheck": "mysqlcheck databaseName tableName" - Checks the specified table in the specified database. "mysqlcheck databaseName" - Chec... 2018-02-28, 2848🔥, 0💬

Differences between CHAR and NCHAR in Oracle
What Are the Differences between CHAR and NCHAR in Oracle? Both CHAR and NCHAR are fixed length character data types. But they have the following differences: CHAR's size is specified in bytes by default. NCHAR's size is specified in characters by default. A character could be 1 byte to 4 bytes long... 2020-04-25, 2847🔥, 0💬

Use SYS Account to Connect to the Server in Oracle
How To Connect to the Server with User Account: SYS in Oracle? SYS is a very special user account. It has been associated with the highest privilege call SYSDBA. Normally, you should not connect to the server with SYS. But if you want to use it, you need to use a special connect command: &gt;cd ... 2019-07-21, 2847🔥, 0💬

Differences between CHAR and VARCHAR in Oracle
What Are the Differences between CHAR and VARCHAR2 in Oracle? The main differences between CHAR and VARCHAR2 are: CHAR stores values in fixed lengths. Values are padded with space characters to match the specified length. VARCHAR2 stores values in variable lengths. Values are not padded with any cha... 2020-04-25, 2846🔥, 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, 2845🔥, 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, 2842🔥, 0💬

Numeric Literals in Oracle
How To Write Numeric Literals in Oracle? Numeric literals can coded as shown in the following samples: SELECT 255 FROM DUAL -- An integer 255 SELECT -6.34 FROM DUAL -- A regular number -6.34 SELECT 2.14F FROM DUAL -- A single-precision floating point 2.14 SELECT -0.5D FROM DUAL -- A double-precision... 2020-04-14, 2839🔥, 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, 2832🔥, 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, 2828🔥, 0💬

JSON_OVERLAPS() - Checking JSON Overlaps
How to check if two JSON values have overlaps using the JSON_OVERLAPS() function? JSON_OVERLAPS(json1, json2) is a MySQL built-in function that detects overlaps of two JSON values using the following rules: If both arguments are objects, overlap means they have at least one key-value pair in common.... 2024-12-18, 2826🔥, 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, 2826🔥, 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, 2824🔥, 0💬

Administrator Tools for Managing MySQL Server
Where to find answers to frequently asked questions on Administrator Tools for Managing MySQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Administrator Tools for Managing MySQL Server. Clear answers are provided with tutorial exercises... 2018-06-06, 2822🔥, 0💬

SCROLL - Creating Cursors for Backward Scrolling in SQL Server
How To Create a Scrollable Cursor with the SCROLL Option in SQL Server Transact-SQL? SQL Server offers two scrolling option on cursors: 1. FORWARD_ONLY - The cursor can only be scrolled forward with "FETCH NEXT" statements. In another word, you can only loop through the cursor from the first row to ... 2016-10-17, 2822🔥, 0💬

Differences of DECIMAL and FLOAT in SQL Server
What Are the Differences between DECIMAL and FLOAT in SQL Server Transact-SQL? DECIMAL and FLOAT are both used to store numerical values. But they have the following main differences: DECIMAL(p,s) stores values with the decimal point fixed at the position of s (scale) digits from the right. The tota... 2017-04-15, 2818🔥, 0💬

"DROP LOGIN" - Deleting a Login Name in SQL Server
How To Delete a Login Name in SQL Server? If you don't want to keep a login name any more, you should delete it by using the "DROP LOGIN" statement as shown in this tutorial example: -- Login with "sa" DROP LOGIN Dba_Login; GO Command(s) completed successfully. -- View login names SELECT name, sid, ... 2016-10-19, 2817🔥, 0💬

Instance Settings Stored in SPFile in Oracle
Where Are the Settings Stored for Each Instance in Oracle? Settings for each instance are stored in a file called Server Parameter File (SPFile). Oracle supports two types of parameter files, Text type, and Binary type. parameter files should be located in $ORACLE_HOME\database directory. A paramete... 2020-09-15, 2816🔥, 0💬

Select Some Rows from a Table in Oracle
How To Select Some Rows from a Table in Oracle? If you don't want select all rows from a table, you can specify a WHERE clause to tell the query to return only the rows that meets the condition defined in the WHERE clause. The following select statement only returns rows that has department name sta... 2019-12-19, 2816🔥, 0💬

Types of Data Literals in SQL Server Transact-SQL
What are different types of data literals supported in SQL Server Transact-SQL? There are 8 types of data literals supported in SQL Server Transact-SQL: 1. Integer Number Literals - Sequences of numbers prefixed with +/- sign if needed. Integer number literals are used to represent integer values. F... 2017-05-20, 2816🔥, 0💬

"GRANT EXECUTE" Statements - Granting EXECUTE permission in SQL Server
How to grant a permission using "GRANT EXECUTE" statements in SQL Server? This is the fourth tutorial of a quick lesson on creating login and configure users for databases with Transact-SQL statements. Granting a user access to a database involves three steps. First, you create a login. The login le... 2016-11-27, 2815🔥, 0💬

Create a New Data File in Oracle
How To Create a New Oracle Data File in Oracle? There is no dedicated statement to create a data file. Data files are created as part of statements that manages other data structures, like tablespace and database.   ⇒ Create a New Tablespace in Oracle ⇐ Show All Data Files in the Current Database i... 2019-04-13, 2814🔥, 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, 2814🔥, 0💬

Creating a Logon Trigger in Express Edition in SQL Server
Can You Create a Logon Trigger in SQL Server 2005 Express Edition in SQL Server? Can you create a logon trigger in SQL Server 2005 Express Edition? The answer is no. LOGON is not a supported event type in Express Edition. The script below shows you the error message when you try to create a logon tr... 2016-10-22, 2814🔥, 0💬

Managing Tables and Running Queries with PHP for MySQL
Where to find answers to frequently asked questions on Managing Tables and Running Queries with PHP for MySQL? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Tables and Running Queries with PHP for MySQL. Clear explanations and tutorial ... 2017-10-08, 2812🔥, 0💬

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General MySQL Oracle SQL Server