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Relational Database Management system (RDBMS) is a database management system (DBMS) that is based on the relational model. DDL – Data Definition Language DDL is used to define the structure that holds the data. This is mainly used to capture and save data about each event of a file or a table for analysis. Recursive stored procedure can be defined as a method of problem solving wherein the solution is arrived repetitively. Example Or we can include WITHRECOMPILE in the stored procedure itself. User Names and Passwords are stored in sys.server_principals and sys.sql_logins. Both are same but GETDATE can give time till milliseconds and SYSDATETIME can give precision till nanoseconds. INSERT INTO SELECT This command is used to insert data into a table which is already created. TABLESAMPLE is used to extract sample of rows randomly that are all necessary for the application. SQL injection is an attack by malicious users in which malicious code can be inserted into strings that can be passed to an instance of SQL server for parsing and execution.
Select statement is considered as a limited version of DML, since it can’t change data in the database. SQL is not a proprietary language used by specific database vendors. The statements are all made up of descriptive English words, and there aren’t that many of them. SQL is actually a very powerful language and by using its language elements you can perform very complex and sophisticated database operations. Those user defined messages are stored in sys.messages table. Columns and variables are created and store XML instances in the database. Following are the methods used to protect against SQL injection attack: 50. Filtered Index is used to filter some portion of rows in a table to improve query performance, index maintenance and reduces index storage costs.
SIGN function is used to determine whether the number specified is Positive, Negative and Zero. It can be executed automatically on insert, delete and update operations. Global temporary tables are represented with ## before the table name. What are the differences between Stored Procedure and the dynamic SQL? The SUBSTR function is used to return specific portion of string in a given string. = is used to assign one value or variable to another variable. === is used to compare only string with the string and number with numbers. This function also provides to replace a value with the NULL. This clause is mainly used to display the query results in XML format or in browser. What will be the maximum number of index per table?
Triggers are automatically triggered or executed when the data is modified. It will not remove duplicate rows, instead it will retrieve all rows from all tables. How Global temporary tables are represented and its scope? Name of the stored procedure is saved in the table called Sys. These magic tables are used inside the triggers for data transaction. What is the difference between SUBSTR and INSTR in the SQL Server? ISNULL function is used to check whether value given is NULL or not NULL in sql server. FOR clause is mainly used for XML and browser options.
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Example: Oracle has OLE-DB provider which has link to connect with the SQL server group. Exceptions are handled using TRY—-CATCH constructs and it is handles by writing scripts inside the TRY block and error handling in the CATCH block. Every statement between BEGIN and COMMIT becomes persistent to database when the COMMIT is executed.
SQL server can be connected to any database which has OLE-DB provider to give a link. A sub-query is a query which can be nested inside a main query like Select, Update, Insert or Delete statements. User can also order the tasks in which it has to be generated. This function is used to return a non-null from more than one column in the arguments. How exceptions can be handled in SQL Server Programming? FLOOR function is used to round up a non-integer value to the previous least integer. 1 Clustered Index and 999 Non-clustered indexes per table can be used in SQL Server. What is the difference between COMMIT and ROLLBACK?
Data from relational database can be accessed using an API , Structured Query Language (SQL). SQL is an ANSI (American National Standards Institute) standard. Typical operations are Insert, Delete, Update and retrieving the data from the table. A field is an area within a record reserved for a specific piece of data. RAISEERROR is the command used to generate and initiates error processing for a given session. XML data type is used to store XML documents in the SQL Server database. CDC is abbreviated as Change Data Capture which is used to capture the data that has been changed recently. Even parameters can be manipulated by the skilled and experienced attackers. What are the methods used to protect against SQL injection attack?