General MySQL Oracle SQL Server

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Deleting a Table That Is Used by a View in SQL Server
What Happens If You Delete a Table That Is Used by a View in SQL Server? Assuming that you have a table which is used by a view, and you try to delete that table. SQL Server will let you delete the table without any trouble. But that view will become invalid. The tutorial exercise below shows you wh... 2016-11-04, 2780🔥, 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, 2780🔥, 0💬

"CREATE TRIGGER" - Creating a DML Trigger in SQL Server
How To Create a DML Trigger using CREATE TRIGGER Statements in SQL Server? A DML trigger is a trigger declared to handle a DML event, which occurs when an INSERT, UPDATE or DELETE statement is executed. If you want to create a DML trigger, you should use the "CREATE TRIGGER" statement in the followi... 2016-10-25, 2779🔥, 0💬

Converting Numeric Expressions from One Data Type to Another in SQL Server
How To Convert a Numeric Expression from One Data Type to Another in SQL Server Transact-SQL? There are 4 ways to convert a numeric expression from one data type to another data type: Implicit conversion by arithmetic operations - When arithmetic operations are performed on expressions of different ... 2017-03-27, 2777🔥, 0💬

Getting a List of All Databases on the Server in SQL Server
How to get a list all databases on the SQL server in SQL Server? If you don't remember database names you have created, you can get a list of all databases on the server by query the "sys.databases" view as shown in this tutorial example: CREATE DATABASE FyiCenterData GO SELECT name, database_id, cr... 2016-11-24, 2777🔥, 0💬

Creating an Index for Multiple Columns in SQL Server
How To Create an Index for Multiple Columns in SQL Server? An index for multiple columns works similarly to a sorting process on multiple columns. If an index is defined for two columns, the index key is composed by values from those two columns. A multi-column index will be used to speed up the sea... 2016-11-13, 2775🔥, 0💬

PHP ODBC - odbc_fetch_array() - Looping through Returning Rows
PHP ODBC - How To Loop through Returning Rows? The best way to query tables and loop through returning rows is to run a SELECT statement with the odbc_exec() function, catch the returning object as a result set, and loop through the result with odbc_fetch_array() function in a while loop as shown in... 2024-05-29, 2774🔥, 0💬

SQL Server FAQs - PHP ODBC Functions - Connection and Query Execution
A collection of 14 FAQs on using PHP ODBC functions to connect to SQL Server databases. Clear explanations and tutorial exercises are provided on testing ODBC DSN settings; creating connection to a SQL Server through a DSN; executing SQL statements; looping through result set; Executing prepared sta... 2024-03-17, 2773🔥, 0💬

PHP MSSQL - Query Multiple Tables Jointly
PHP MSSQL - How To Query Multiple Tables Jointly? If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile, "forums" for forums information, a... 2024-02-09, 2773🔥, 0💬

"CREATE SCHEMA" - Creating a New Schema in a Database in SQL Server
How To Create a New Schema in a Database in SQL Server? If you want to create a new schema in an existing database, you can use the "CREATE SCHEMA" statement as shown in the tutorial example below: USE FyiCenterData; GO CREATE SCHEMA fyi; GO Command(s) completed successfully. A new schema called "fy... 2016-10-22, 2773🔥, 0💬

Managing Databases and Physical Files in SQL Server
Where to find answers to frequently asked questions on Managing Databases and Physical Files in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Managing Databases and Physical Files in SQL Server. Clear answers are provided with tutori... 2016-11-24, 2770🔥, 0💬

ntwdblib.dll - SQL Server Client Library DLL
What Is Wrong with SQL Server Client Library DLL, ntwdblib.dll? The second requirement to access SQL Server with PHP scripts is the SQL Server Client Library DLL, ntwdblib.dll. The good news is that the Windows binary version of PHP 5.2.3 has ntwdblib.dll included in the PHP home directory. But the ... 2024-04-14, 2768🔥, 0💬

Performing Comparison on Character Strings in SQL Server
How To Perform Comparison on Character Strings in SQL Server Transact-SQL? Comparison operations on character strings are performed based on the associated collation. Each collation defines rules on how characters are ordered, how character cases and accents are treated, etc. The tutorial exercise b... 2017-01-21, 2767🔥, 0💬

Using Subqueries in the FROM Clause in SQL Server
How To Use Subqueries in the FROM Clause in SQL Server? If you have a query returning many rows of data, and you want to perform another query on those rows, you can put the first query as a subquery in the FROM clause of the second query. A subquery used in this way become a temporary table, and yo... 2016-10-29, 2757🔥, 0💬

MS SQL Server DBA Checklist - General DBA Best Practices
-- Join (or start) a local SQL Server users group -- Attend at least one professional conference each year. -- Attend at least one training session each year. -- Read at least four books on SQL Server each year. -- Read the free e-book, How to Become an Exceptional DBA -- Learn everything you can ab... 2022-01-24, 2756🔥, 0💬

Creating Stored Procedures with Parameters in SQL Server
How To Create Stored Procedures with Parameters in SQL Server Transact-SQL? Very often, you need to create a stored procedure with one or more parameters. You only supply values to those parameters at the time of executing the stored procedure. Stored procedures with parameters can be created with t... 2017-01-05, 2756🔥, 0💬

Syntaxes of Creating Table-Valued Functions in SQL Server
How Many Ways to Create Table-Valued Functions in SQL Server Transact-SQL? SQL Server supports two syntaxes of creating table-valued functions: 1. Inline Table-valued Functions - A table-valued function created with a single SELECT statement: CREATE FUNCTION function_name( @parameter_1 data_type, @p... 2016-12-18, 2755🔥, 0💬

Overflow Errors on Converting Big Values to Integers in SQL Server
What Happens When Converting Big Values to Integers in SQL Server Transact-SQL? If you are converting a numeric expression to an integer data type and the value is too big for integer storage size, you will get an arithmetic overflow error as shown in the following examples: -- Overflow error on imp... 2017-03-22, 2753🔥, 0💬

Using SELECT Statements with Joins and Subqueries in SQL Server
Where to find answers to frequently asked questions on Using SELECT Statements with Joins and Subqueries in SQL Server? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com DBA team on Using SELECT Statements with Joins and Subqueries in SQL Server. Clear answers ... 2016-10-30, 2753🔥, 0💬

Running SQL Server 2005 Books Online on Your Local System in SQL Server
How to run SQL Server 2005 Books Online on your local system in SQL Server? SQL Server 2005 Books Online can be accessed by a Web browser over the Internet. But you can also download it and read it on your local system. If you have downloaded and installed SQL Server 2005 Books Online package, you f... 2016-12-04, 2751🔥, 0💬

Getting "Connection failed" Error on ODBC DSN Creation
Why Am I Getting Errors When Creating a New ODBC DSN? Continue from the previous tutorial. After clicking Next on the SQL login information screen, ODBC manager will try to connect to the SQL Server with the login information you provided. After a period of waiting time, you may get error message bo... 2024-08-06, 2748🔥, 0💬

Duplicate Key Error on Primary Key Columns in SQL Server
What Happens If You Insert a Duplicate Key for the Primary Key Column in SQL Server? If your table has a primary key column, and you are trying to insert a new row with duplicate key value on the primary key column, you will get an error. The reason is simple - Primary key column does not allow dupl... 2016-11-02, 2748🔥, 0💬

EXISTS - Testing Subquery Results in SQL Server
How To Test Subquery Results with the EXISTS Operator in SQL Server Transact-SQL? EXISTS is a special operator used to test subquery results. EXISTS can be used in two ways: EXISTS (SELECT ...) -- Returns TRUE if the specified subquery has one or more rows returned. NOT EXISTS (SELECT ...) -- Return... 2017-01-21, 2745🔥, 0💬

What Is a Database in SQL Server
What is a database in SQL Server? A database is a logical container that contains a set of related database objects: Tables - Storages of structured data. Views - Queries to present data from tables. Indexes - Sorting indexes to speed up searches. Stored Procedures - Predefined SQL program units. Us... 2016-11-24, 2745🔥, 0💬

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General MySQL Oracle SQL Server