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Deleting Data from a View in SQL Server
Can You Delete Data from a View in SQL Server? Can you delete data in a view? The answer is no. But if the question is "Can you delete data from the underlying table through view?" The answer is then yes. SQL Server will allow you to delete data from the underlying table through a view. The tutorial...
2016-11-03, 429👍, 0💬

"TOP" - Return the Top 5 Rows from a SELECT Query in SQL Server
How To Return the Top 5 Rows from a SELECT Query in SQL Server? If you want the query to return only the first 5 rows, you can use the "TOP 5" clause. The TOP clause takes one parameter to indicate how many top rows to return. The following statements returns the first 5 rows and 3 rows from the fyi...
2016-10-29, 429👍, 0💬

"ALTER TRIGGER" - Modifying Existing Triggers in SQL Server
How To Modify Existing Triggers using "ALTER TRIGGER" in SQL Server? If you want to make changes to an existing trigger, you could use the "ALTER TRIGGER" statements to refine the trigger again. The tutorial exercise below shows you how to modify the trigger defined in a previous tutorial: USE FyiCe...
2016-10-24, 429👍, 0💬

"mysqld" Command Line Options in MySQL
What Are the "mysqld" Command Line Options in MySQL? "mysqld" offers a big list of command line options. Here are some commonly used options: "--help" - Displays a short help message on how to use "mysqld". "--verbose --help" - Displays a long help messages on how to use "mysqld". "--console" - Spec...
2017-12-04, 428👍, 0💬

Importance of Column Order in the SET Clause in Update Statements in SQL Server
Is the Order of Columns in the SET Clause Important in SQL Server? The answer is NO. The order of columns in the SET clause of the UPDATE statement is NOT important. You probably already noticed from the previous tutorial. There is a BIG DIFFERENCE among SQL Server, MySQL and Oracle on update multip...
2016-11-02, 428👍, 0💬

Deleting All Rows with DELETE Statements in SQL Server
How To Delete All Rows with DELETE Statements in SQL Server? If you want to delete all rows from a table, you have two options: Use the DELETE statement with no WHERE clause. Use the TRUNCATE TABLE statement. Here is an example of deleting all rows with a DELETE statement: SELECT COUNT(*) FROM fyi_l...
2016-10-30, 428👍, 0💬

Incrementing a Date by 1 in MySQL
How To Increment Dates by 1 in MySQL? If you have a date, and you want to increment it by 1 day, you can use the DATE_ADD(date, INTERVAL 1 DAY) function. You can also use the date interval add operation as "date + INTERVAL 1 DAY". The tutorial exercise below gives you some good examples: SELECT DATE...
2017-12-26, 427👍, 0💬

"CREATE LOGIN" Statements - Creating a Login in SQL Server
How to create a login to access the database engine using "CREATE LOGIN" statements in SQL Server? This is the first 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 crea...
2016-12-02, 427👍, 0💬

Renaming Database Names in SQL Server
How to rename databases in SQL Server? If don't like the name of a database, you can change it by using the "ALTER DATABASE" statement with the following syntax: ALTER DATABASE database_name MODIFY NAME = new_database_name The tutorial example below shows you how change the database name from "FyiCe...
2016-11-24, 427👍, 0💬

"DROP TRIGGER" - Deleting Existing Triggers in SQL Server
How To Delete Existing Triggers using "DROP TRIGGER" in SQL Server? If you don't want to use a trigger any more, you should delete it from the database by using the "DROP TRIGGER" statement as shown in tutorial example: USE FyiCenterData; GO DROP TRIGGER new_user; GO SELECT * FROM sys.triggers GO na...
2016-10-24, 426👍, 0💬

Deleting a User Account in MySQL
How To Delete a User Account in MySQL? If you want to delete a user account, you can connect to the server as "root" and use the "DROP USER ..." command to delete a user account. The tutorial exercise below shows you a good example: &gt;cd \mysql\bin &gt;mysql -u root -pretneciyf mysql mysql...
2017-12-13, 425👍, 0💬

DROP VIEW - Deleting Existing Views in SQL Server
How To Drop Existing Views from a Database in SQL Server? If you don't need a specific view any more, you can use the DROP VIEW statement to delete it from the database. The following tutorial exercise shows you how to delete the view, fyi_links_view: USE FyiCenterData; GO SELECT * FROM sys.views; G...
2016-11-05, 425👍, 0💬

Moving Database Physical Files to New Locations in SQL Server
How to move database physical files in SQL Server? If you want to move database physical files to a new location, you can use the "ALTER DATABASE" statements to bring the database offline, and link it to the files at the new location. The following tutorial gives you a good example: ALTER DATABASE F...
2016-11-20, 424👍, 0💬

Deleting Multiple Rows with One DELETE Statement in SQL Server
How To Delete Multiple Rows with One DELETE Statement in SQL Server? You can delete multiple rows from a table in the same way as deleting a single row, except that the WHERE clause will match multiple rows. The tutorial exercise below deletes 3 rows from the fyi_links table: -- view rows to be dele...
2016-10-30, 424👍, 0💬

SINGLE_USER/MULTI_USER - Database User Access Options in SQL Server
How to set database to be SINGLE_USER in SQL Server? Databases in SQL Server have three user access options: MULTI_USER - All users that have the appropriate permissions to connect to the database are allowed. This is the default. SINGLE_USER - One user at a time is allowed to connect to the databas...
2016-11-20, 423👍, 0💬

"GROUP BY" - Dividing Query Output into Multiple Groups in SQL Server
How To Divide Query Output into Multiple Groups with the GROUP BY Clause in SQL Server? Sometimes, you want to divide the query output into multiple groups, and apply group functions on each individual groups. Dividing query output into multiple groups can be done with the GROUP BY clause. Here is t...
2016-10-25, 423👍, 0💬

Default Schema of Your Login Session in SQL Server
What Is the Default Schema of Your Login Session in SQL Server? When you login to a SQL Server and select a database to use, SQL Server will assign your login session a default schema. The schema name can be omitted when you refer to objects in the default schema. Here is what you should remember ab...
2016-10-22, 423👍, 0💬

Cannot Use DDL Statements in PL/SQL in Oracle
Can DDL Statements Be Used in PL/SQL in Oracle? No, you can not run any DDL statements is PL/SQL directly. If you try to use the DROP TABLE statement inside PL/SQL, you will get a compilation error as shown below: (Connect to XE with SQL*Plus) BEGIN DROP TABLE student; -- compilation error END; /   ...
2018-10-13, 422👍, 0💬

Show Free Space in a Tablespace in Oracle
How To See Free Space of Each Tablespace in Oracle? One of the important DBA tasks is to watch the storage usage of all the tablespaces to make sure there are enough free space in each tablespace for database applications to function properly. Free space information can be monitored through the USER...
2019-01-01, 421👍, 0💬

Running MySQL Server on a Specific Port in MySQL
How To Run MySQL Server on a Different Port in MySQL? By default, MySQL will listen at port number 3306 for any client connections. But you can change this by starting the server with "--port=portNumber" option. The tutorial exercise shows you how to start the server to listen to a different port nu...
2017-11-29, 420👍, 0💬

Sorting Query Output in Descending Order in SQL Server
How To Sort Query Output in Descending Order in SQL Server? If you want to sort a column in descending order, you can specify the DESC keyword in the ORDER BY clause. The following SELECT statement first sorts the "tag" in descending order, then sorts the "counts" in ascending order: SELECT tag, cou...
2016-10-26, 419👍, 0💬

Mixing Group Functions with Non-group Selection Fields in SQL Server
Can Group Functions Be Mixed with Non-group Selection Fields in SQL Server? If a group function is used in the SELECT clause, all other selection fields must be group level fields. Non-group fields can not be mixed with group fields in the SELECT clause. The script below gives you an example of inva...
2016-10-25, 419👍, 0💬

"OPEN" - Executing the Query of a Cursor in SQL Server
How To Execute the Cursor Queries with "OPEN" Statements in SQL Server Transact-SQL? Once a cursor is declared, you need to execute the query attached to the cursor so that the result set returned from the query can be accessed through the cursor. To execute the cursor query, you should use the OPEN...
2016-10-17, 419👍, 0💬

Subtracting a DATETIME Value from Another DATETIME Value in SQL Server
Can a DATETIME Value Be Subtracted from Another DATETIME Value in SQL Server Transact-SQL? Can a datetime value be subtracted from another datetime value? The answer is yes. The subtract operation can be performed by the subtract operator (-) as: datetime1 - datetime2: Returning a DATETIME value cal...
2017-02-20, 418👍, 0💬

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