While integration with Sybase server, I had to study some queries. When me and Sybase administrator couldn't understand the reason of error, we have started to look for missed procedures or tables. So, when I had to use some queries to look for tables, view, stored procedures etc.
To receive quantity of rows of the returned records of SQL query, you should use function @@ROWCOUNT. Function @@ROWCOUNT returns the quantity of rows, which were used in a query.
How to get as SQL query result the list of databases in SQL server.
select name, database_id from sys.databases
When you modify columns of a table in MS SQL management studio, you got the message "Saving changes is not permitted. The changes you have made require the following table to be dropped and re-created … " (Figure 1). The reason of this is re-creating of table. It's really important for productive environment but not very for test ones.
Rename table in MS SQL Server:
sp_rename 'old table name', 'new table name'
When you restore a database from backup to your SQL server in test environment, you will try to add Role to a restored database for user. At this time you may get the error message:
An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo). User, group or role 'UserName' already exists in the current database. (Microsoft SQL Server Error" 15023). (read more...)
It’s a little tutorial about how to get all duplicate records on namesakes example from your database table. For example, we have a table with columns Id, FullName, Birthdate and Phone.
Using 'GROUP BY' and 'HAVING' we can select all namesakes. (read more...)
Concatenating of string columns is not very simple task in T-SQL if you don’t know ANSI standart of it. According to ANSI standart of SQL, concatenating of NULL-value is NULL in the result. It’s not clearly for developer, but it is so.
Let’s see some features for work with concatenating NULL-value columns. For example, I will use tutorial database Northwind and its table Customers. (read more...)
This post is about which string functions there are in Transact-SQL. They allow to modify data you have, make custom queries to select records from database tables. To know them is very important for any developer - using string functions is very good way to decrease load from application server without adding it to SQL because string functions on SQL server work very fast. (read more...)
Another way for using conditions in Transact-SQL besides IF…ELSE is CASE operator. The syntax is some different from IF…ELSE but in some cases more readable. CASE also uses the word "THEN". (read more...)
