General MySQL Oracle SQL Server

<< < … 14 15 16 17 18 19 20 21 22 23 24 … > >>   ∑:1360  Sort:Date

"INNER JOIN ... ON" - Writing Queries with Inner Joins in SQL Server
How To Write a Query with an Inner Join in SQL Server? If you want to query from two tables with an inner join, you can use the INNER JOIN ... ON clause in the FROM clause. The tutorial exercise below creates another testing table and returns output with an inner join from two tables: fyi_links and ... 2016-10-30, 3209🔥, 0💬

Transaction Rollback When Session Killed in Oracle
What Happens to the Current Transaction If the Session Is Killed in Oracle? 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 ses... 2019-08-23, 3208🔥, 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, 3208🔥, 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, 3206🔥, 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, 3206🔥, 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, 3202🔥, 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, 3200🔥, 0💬

Character String Data Types in MySQL
What Are Character String Data Types in MySQL? MySQL supports the following string data types: CHAR(n) same as CHARACTER(n) - Fixed width and " " padded characters strings. Default character set is ASCII. NCHAR(n) same as NATIONAL CHARACTER(n) - Fixed width and " " padded character strings with UTF8... 2018-04-12, 3200🔥, 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, 3197🔥, 0💬

Updating Existing Rows in MySQL
How To Update Existing Rows in a Table in MySQL? Updating existing rows in a table requires to run the UPDATE statement with a WHERE clause to identify the row. The following sample script updates one row with two new values: &lt;?php include "mysql_connection.php"; $sql = "UPDATE fyi_links SET ... 2023-09-10, 3196🔥, 1💬

💬 2023-09-10 Pintu kumar: To update existing rows in a table in MySQL, you can use the UPDATE statement. Here's a general syntax for updating rows in MySQ...

Assign a Tablespace to a User in Oracle
How To Assign a Tablespace to a Users in Oracle? When you create a new user, Oracle will assign the SYSTEM tablespace to the user by default. If you want to change this, you can assign a different table space to a user using the ALTER USER command. The following tutorial exercise changes user dev's ... 2019-06-29, 3195🔥, 0💬

Start and End of Statement in SQL Server Transact-SQL
How to start and end a statement in SQL Server Transact-SQL? Here are some simple rules about writing statements in SQL Server Transact-SQL: A Transact-SQL statement must be started with a pre-defined statement keyword. A Transact-SQL statement must be ended with a new line (/n) or a semicolon (;) c... 2017-05-29, 3194🔥, 0💬

Creating Stored Procedures with Statement Blocks in SQL Server
How To Create a Stored Procedure with a Statement Block in SQL Server Transact-SQL? If you are creating a stored procedure with multiple statements, it's better to use "BEGIN ... END" to group all statements into a single statement block. The tutorial exercise below shows you some good examples: USE... 2017-01-05, 3194🔥, 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, 3191🔥, 0💬

ANSI Data Types in Oracle
What Are the ANSI Data Types Supported in Oracle in Oracle? The following ANSI data types are supported in Oracle: CHARACTER(n) / CHAR(n) CHARACTER VARYING(n) / CHAR VARYING(n) NATIONAL CHARACTER(n) / NATIONAL CHAR(n) / NCHAR(n) NATIONAL CHARACTER VARYING(n) / NATIONAL CHAR VARYING(n) / NCHAR VARYIN... 2020-04-14, 3190🔥, 0💬

Connecting to MySQL Server on a Specific Port in MySQL
How To Connect to MySQL Server on a Different Port in MySQL? If your MySQL server is listening on port number different than 3306, you need to specify "--port=portNumber" option to any client program that needs to connect to the server. The tutorial exercise shows you how to connect "mysql" to start... 2017-11-25, 3190🔥, 0💬

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, 3189🔥, 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, 3183🔥, 0💬

Entering Characters as HEX Numbers in MySQL
How To Enter Characters as HEX Numbers in MySQL? If you want to enter characters as HEX numbers, you can quote HEX numbers with single quotes and a prefix of (X), or just prefix HEX numbers with (0x). A HEX number string will be automatically converted into a character string, if the expression cont... 2018-03-31, 3179🔥, 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, 3179🔥, 0💬

Convert Times to Character Strings in Oracle
How To Convert Times to Character Strings in Oracle? You can convert dates to characters using the TO_CHAR() function as shown in the following examples: SELECT TO_CHAR(SYSDATE, 'HH:MI:SS') FROM DUAL; 04:49:49 SELECT TO_CHAR(SYSDATE, 'HH24:MI:SS.FF') FROM DUAL; -- Error: SYSDATE has no fractional se... 2019-12-02, 3177🔥, 0💬

MySQL Server Features in MySQL
What Is MySQL in MySQL? MySQL is an open source database management system developed by MySQL AB, http://www.mysql.com. MySQL has the following main features: Works on many different platforms. APIs for C, C++, Eiffel, Java, Perl, PHP, Python, Ruby, and Tcl are available. Fully multi-threaded using ... 2018-06-12, 3175🔥, 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, 3175🔥, 0💬

Ways to Start a New Transaction in Oracle
How To Start a New Transaction in Oracle? There is no SQL statement to explicitly start a new transaction. Oracle server implicitly starts a new transaction with the following two conditions: The first executable statement of a new user session will automatically start a new transaction. The first e... 2019-09-16, 3174🔥, 0💬

<< < … 14 15 16 17 18 19 20 21 22 23 24 … > >>   ∑:1360  Sort:Date

General MySQL Oracle SQL Server