General MySQL Oracle SQL Server

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Connecting Windows Applications to SQL Servers via ODBC
How Can Windows Applications Connect to SQL Servers via ODBC? One way of connecting a windows application to a SQL Server is to use ODBC drivers. The requirements to do this is summarized here: The SQL Server must have TCP/IP protocol enabled with a specific port number. The SQL Server Browser Servi... 2024-03-17, 2311🔥, 0💬

Using Subqueries with the IN Operators in SQL Server
How To Use Subqueries with the IN Operators in SQL Server? A subquery can be used with the IN operator as "expression IN (subquery)". The subquery should return a single column with one or more rows to form a list of values to be used by the IN operation. The following tutorial exercise shows you ho... 2016-10-29, 2311🔥, 0💬

mssql_close() - Disconnecting from a SQL Server
How To Disconnect from a SQL Server using mssql_close()? When you call mssql_connect(), it will return an object representing the connection to the SQL Server. This connection object will be used by subsequent MSSQL function calls. When you are done with this connection, you should close it to free ... 2024-04-07, 2308🔥, 0💬

UNCOMPRESS() - Uncompressing Data
How to uncompress (restore) compressed data using the UNCOMPRESS() function? UNCOMPRESS(str) is a MySQL built-in function that uncompresses a given compressed byte string using the default LZ77 compression algorithm. For example: SELECT UNCOMPRESS(x'37000000789C738BF 44C4ECD2B492DD24BCECFD57123960 700... 2024-12-18, 2307🔥, 0💬

Adding More Test Data for Query Statements in SQL Server
How To Add More Data to the Testing Table in SQL Server? If you want to continue with other tutorial exercises in this FAQ collection, you need to add more data to the testing table. Follow the script below to add a new column and more rows: ALTER TABLE fyi_links ADD tag VARCHAR(8) GO UPDATE fyi_lin... 2016-10-26, 2306🔥, 0💬

Creating a Simple Table to Test Triggers in SQL Server
How To Create a Simple Table to Test Triggers in SQL Server? If you want to follow other tutorial examples included in this collection, you need to run this SQL script to create a simple table called fyi_users: USE FyiCenterData; GO DROP TABLE fyi_users; GO CREATE TABLE fyi_users ( id INTEGER IDENTI... 2016-10-25, 2304🔥, 0💬

Update Values in a Table in Oracle
How To Update Values in a Table in Oracle? If you want to update some values in one row or multiple rows in a table, you can use the UPDATE statement. The script below shows a good example: UPDATE fyi_links SET counts = 999, notes = 'Good site.' WHERE id = 101; 1 row updated. SELECT * FROM fyi_links... 2020-01-21, 2303🔥, 0💬

Missing ntwdblib.dll for MSSQL connection
What Happens If ntwdblib.dll Is Missing on Your Machine? In order to install the proper version of ntwdblib.dll on your machine, you need to find out how many copies of ntwdblib.dll do you have on your machine and what are the version numbers on those copies. 1. Go to Start &gt; Search &gt; ... 2024-04-14, 2302🔥, 0💬

Using LIKE Conditions in MySQL
How To Use LIKE Conditions in MySQL? A LIKE condition is also called pattern patch. There are 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 char... 2018-03-24, 2299🔥, 0💬

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, 2298🔥, 0💬

Assign Field Values into RECORD Variables in Oracle
How To Assign Values to Data Fields in RECORD Variables in Oracle? If a variable is a RECORD variable, you can assign values to its data fields by using fields names prefixed with variable name as "variable.field_name". Here is a sample script assigning values to data fields of RECORD variables: CRE... 2018-09-01, 2293🔥, 0💬

What Is a SELECT Query Statement in MySQL
What Is a SELECT Query Statement in MySQL? The SELECT statement is also called the query statement. It is the most frequently used SQL statement in any database application. A SELECT statement allows you to retrieve data from one or more tables or views, with different selection criteria, grouping c... 2017-11-05, 2291🔥, 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, 2290🔥, 0💬

SESSION_USER() - Synonym for USER()
What's the difference between SESSION_USER() and USER() functions? SESSION_USER() is a synonym for the USER() function. Related MySQL functions: USER() - Login Name of Current User SESSION_USER() - Synonym for USER() SYSTEM_USER() - Synonym for USER() CURRENT_USER() - Authentication Name of Current ... 2025-01-07, 2288🔥, 0💬

odbc_columns() - Listing All Columns in a Table
How To List All Columns in a Table using odbc_columns()? If you want to get a list of all columns in a table, you can use the odbc_columns() function, which can actually be used to list all columns in all tables and views in the database. The syntax of odbc_columns() is: $result_set = odbc_columns($... 2024-06-03, 2287🔥, 0💬

PHP ODBC - Inserting Data into an Existing Table
PHP ODBC - How To Insert Data into an Existing Table? If you want to insert a row of data into an existing table, you can use the INSERT INTO statement as shown in the following sample script: &lt;?php $con = odbc_connect('FYI_SQL_SERVER', 'sa','FYIcenter');$sql = "INSERT INTO fyi_links (id, url... 2024-06-03, 2285🔥, 0💬

Filtering Out Duplications in the Returning Rows in SQL Server
How To Filter Out Duplications in the Returning Rows in SQL Server? If there are duplications in the returning rows, and you want to remove the duplications, you can use the keyword DISTINCT in the SELECT clause. The DISTINCT applies to the combination of all data fields specified in the SELECT clau... 2016-10-26, 2284🔥, 0💬

PHP ODBC - odbc_num_rows() - Number of Affected Rows
PHP ODBC - How To Get the Number of Affected Rows? If you insert multiple rows with a single INSERT statement, you can use the odbc_num_rows() function to find out how many rows were inserted. odbc_num_rows($result_set) returns the number of affected rows based on the result set object returned by t... 2024-05-29, 2283🔥, 0💬

Using User Defined Functions in Expressions in SQL Server
How To Use User Defined Functions in Expressions in SQL Server Transact-SQL? An user defined function must return a value, which can be used in any expression as long as the return value data type matches the expression. To execute a user defined function and use its return value in an expression, y... 2016-12-24, 2282🔥, 0💬

odbc_data_source() - Listing All DSN Entries
How To List All DSN Entries on Your Local Machine using odbc_data_source()? If you are interested to know what DSN entries are available on your local machine, you can use odbc_data_source($con, SQL_FETCH_FIRST) and odbc_data_source($con, SQL_FETCH_NEXT) in a loop to list all DSN entries defined on ... 2024-07-11, 2279🔥, 0💬

PHP ODBC - Creating an Identity Column
PHP ODBC - How To Create an Identity Column? Many tables require an ID column to assign a unique ID number for each row in the table. For example, if you have a table to hold forum member profiles, you need an ID number to identify each member. To allow SQL Server to automatically assign a new ID nu... 2024-04-29, 2276🔥, 0💬

Configuring and Testing ODBC DSN Settings
How To Configure and Test ODBC DSN Settings? Continue from the previous tutorial. Click Next after you have finished changing the port number. The ODBC Data Source Administrator will try to connect to the SQL server through the specified port number and login information. If the connection is succes... 2024-07-25, 2272🔥, 0💬

mssql_get_last_message() - Retrieving Error Messages
How To Retrieve Error Messages using mssql_get_last_message()? When you call mssql_query() to execute a SQL statement, and the execution failed on the SQL Server, you can use mssql_get_last_message() function to retrieve the error messages. The tutorial script below shows you a good example: &lt... 2024-04-07, 2268🔥, 0💬

Using Group Functions in the ORDER BY Clause in MySQL
Can Group Functions Be Used in the ORDER BY Clause in MySQL? If the query output is aggregated as groups, you can sort the groups by using group functions in the ORDER BY clause. The following statement returns how many links were created in each year in each tag. The group output is sorted by the c... 2017-12-31, 2267🔥, 0💬

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General MySQL Oracle SQL Server