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Database in Use When Renaming a Database in SQL Server
Why I am getting this error when renaming a database in SQL Server? If you are trying to rename a database that is in use, you will get an error message like this: "The database could not be exclusively locked to perform the operation." Before renaming a database, you must stop all client sessions u...
2016-11-20, 617👍, 0💬

"sp_help" - Getting a List of Columns in a Table in SQL Server
How To Get a List of Columns using the "sp_help" Stored Procedure in SQL Server? Another way to get a list of columns from a table is to use the "sp_help" stored procedure. "sp_help" returns more than just a list of columns. It returns: the table information, the column information, the identity col...
2016-11-17, 617👍, 0💬

Show the Current Transaction Mode in MySQL
How To Find Out the Current Transaction Mode in MySQL? If you are not sure about your current transaction mode, you can use the "SELECT @@AUTOCOMMIT FROM DUAL" statement to find out as shown in the following tutorial exercise: &gt;\mysql\bin\mysql -u dev -piyf fyi mysql&gt; SELECT @@AUTOCOMM...
2016-10-17, 617👍, 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, 616👍, 0💬

Update Column Values on Multiple Rows in MySQL
How To Update Column Values on Multiple Rows in MySQL? If the WHERE clause in an UPDATE matches multiple rows, the SET clause will be applied to all matched rows. This rule allows you to update values on multiple rows in a single UPDATE statement. Here is a good example: mysql&gt; UPDATE fyi_lin...
2018-01-13, 616👍, 0💬

Using Table Alias Names in MySQL
How To Define and Use Table Alias Names in MySQL? When column names need to be prefixed with table names, you can define table alias name and use them to prefix column names as shown in the following select statement: mysql&gt; SELECT l.id, l.url, r.comment FROM fyi_links l INNER JOIN fyi_rates ...
2017-12-31, 616👍, 0💬

Downloading and Installing SQL Server 2005 Books Online in SQL Server
How to download and install SQL Server 2005 Books Online in SQL Server? 1. Go to the SQL Server 2005 Books Online download page. 2. Click the download button, the File Download box shows up. Save the download file to c:\temp. 3. Double click on the downloaded file: c:\temp\SqlServer2K5_BOL_Feb20 07.m...
2016-12-04, 616👍, 0💬

Create Tables for ODBC Connection Testing in Oracle
How To Create Tables for ODBC Connection Testing in Oracle? If you want to follow the tutorial exercises in the sections below, you need to create a user account and a table for ODBC connection testing as shown here: SQL&gt; CONNECT system/retneciyf Connected. SQL&gt; CREATE USER fyi IDENTIF...
2016-10-15, 616👍, 0💬

Execute a Simple Stored Procedure in Oracle
How To Execute a Stored Program Unit in Oracle? If you want to execute a stored program unit, you can use the EXECUTE statement. The example script below shows how to executes a stored program unit: SQL&gt; set serveroutput on; SQL&gt; CREATE PROCEDURE Hello AS 2 BEGIN 3 DBMS_OUTPUT.PUT_LINE...
2019-03-20, 615👍, 0💬

Creating a Test Table in MySQL
How To Create a Testing Table in MySQL? If you want to practice DML statements, like INSERT, UPDATE and DELETE, you should create a testing table. The tutorial exercise shows you a good example: mysql&gt; CREATE TABLE fyi_links (id INTEGER PRIMARY KEY, url VARCHAR(80) NOT NULL, notes VARCHAR(102...
2018-01-24, 615👍, 0💬

Connect to MySQL Server with Port Number in MySQL
How To Connect to a MySQL Server with a Port Number in MySQL? If you want to connect a MySQL server with a non-default port number, you need to use the "mysql_connect($server)" function with $server in the format of "hostName:portNubmber". The tutorial exercise below shows you how to connect to loca...
2017-11-25, 615👍, 0💬

Query with a Full Outer Join in MySQL
How To Write a Query with a Full Outer Join in MySQL? There is no way to do full outer join in MySQL. It does not support this feature at the current MySQL release.   ⇒SELECT Statements with JOIN and Subqueries in MySQL ⇒⇒MySQL Database Tutorials
2017-09-28, 615👍, 0💬

Restore Tables by Copying MyISAM Files in MySQL
How To Restore Tables by Copying MyISAM Table Files in MySQL? If you have old copies of MyISAM table files, you can restore them easily by copying them back to the data directory to replace the current table files. However you may need to shut down MySQL server to do this, because the current table ...
2017-09-01, 615👍, 0💬

Character String Functions Supported by SQL Server 2005 in SQL Server
What Are the Character String Functions Supported by SQL Server 2005 in SQL Server Transact-SQL? SQL Server 2005 supports 23 character string functions: ASCII(char) - Returning the code value of a non-Unicode character. CHAR(int) - Returning the non-Unicode character of a code value. CHARINDEX(word,...
2017-03-07, 615👍, 0💬

IN - Testing Value in a Value List in SQL Server
What To Test Value Lists with the IN Operator in SQL Server Transact-SQL? Sometimes you want to test a given value against a list of values. You can do this in a loop with the regular "equal" operator. But you can also use the special comparison operator IN to get it done with the following syntaxes...
2017-01-21, 615👍, 0💬

Measuring Performance of INSERT Statements in SQL Server
How To Measure Performance of INSERT Statements in SQL Server? When indexes are defined for a table, each time a new row is inserted to the table, all the indexes must be updated. This extra update work could slow down the insert statement. To find out how much slower the INSERT statements will be o...
2016-11-13, 615👍, 0💬

Define Variables before Procedures and Functions in Oracle
What Is the Order of Defining Local Variables and Sub Procedures/Functions in Oracle? In the declaration part, you must define all local variables before defining any sub procedures or sub functions. See the following sample script: SQL&gt; CREATE OR REPLACE PROCEDURE WELCOME AS 2 SITE CHAR(80) ...
2018-03-18, 614👍, 0💬

Drop an Existing View in MySQL
How To Drop an Existing View in MySQL? If you have an existing view, and you don't want it anymore, you can delete it by using the "DROP VIEW viewName" statement as shown in the following script: mysql&gt; DROP VIEW faqComment; Query OK, 0 rows affected (0.00 sec) mysql&gt; SELECT * FROM faq...
2018-01-24, 614👍, 0💬

Transaction Committed when DDL Statement Executed in MySQL
What Happens to the Current Transaction If a DDL Statement Is Executed in MySQL? If a DDL statement is executed, the current transaction will be committed and ended. All the database changes made in the current transaction will become permanent. This is called an implicit commit by a DDL statement. ...
2016-10-17, 614👍, 0💬

Apply Filtering Criteria at Group Level in Oracle
How To Apply Filtering Criteria at Group Level in Oracle? If you want to return only specific groups from the query, you can apply filtering criteria at the group level by using the HAVING clause inside the GROUP BY clause. The following script gives you a good HAVING example: SQL&gt; SELECT dep...
2019-11-21, 613👍, 0💬

Name Conflicts between Variables and Columns in Oracle
How To Resolve Name Conflicts between Variables and Columns in Oracle? The best way to resolve name conflicts is to avoid using column names for variables.   ⇒Working with Database Objects in Oracle PL/SQL ⇒⇒Oracle Database Tutorials
2018-09-24, 613👍, 0💬

Returning Top 5 Rows in MySQL
How To Return Top 5 Rows in MySQL? If you want the query to return only the first 5 rows, you can use the LIMIT clause, which takes one parameter as the maximum number of rows to return. The following statement returns the first 5 rows from the fyi_links: mysql&gt; SELECT id, url, counts, tag FR...
2017-12-21, 613👍, 0💬

Creating Local Temporary Stored Procedures in SQL Server
How To Create a Local Temporary Stored Procedure in SQL Server Transact-SQL? A local temporary stored procedure is a special stored procedure that: Is created like a normal (permanent) stored procedure with the name prefixed with a number sign (#). Are only valid in the same client session where it ...
2016-12-28, 613👍, 0💬

"ALTER LOGIN" - Changing a Login Name in SQL Server
How To Change a Login Name in SQL Server? If you want to change a login name, you can use the "ALTER LOGIN" statement as shown in this tutorial example: -- Login with "sa" -- Change login name ALTER LOGIN Fyi_Login WITH NAME = Dba_Login; GO -- View login names SELECT name, sid, type, type_desc FROM ...
2016-10-19, 613👍, 0💬

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