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You use the DELETE statement to remove rows from a table. The DELETE statement has the following structure: DELETE FROM <table> [WHERE ,condition>]; For example, if you want to delete employee Fay s row from the employees table, you would use the following DELETE statement: SQL> DELETE FROM employees 2* WHERE last_name='Fay'; 1 row deleted. If you don t have a limiting WHERE condition, the DELETE statement will result in the removal of all the rows in the table, as shown here: SQL> DELETE FROM X; You can also remove all rows in a table using the TRUNCATE command, but you can t undo or roll back the TRUNCATE command s effects. You can undo a delete by using the ROLLBACK statement: SQL> ROLLBACK;

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The UPDATE statement changes the value (or values) of one or more columns of a row (or rows) in a table. The expression to which a column is being set or modified can be a constant, arithmetic, or string operation, or the product of a SELECT statement. The general structure of the UPDATE statement is as follows (note that the elements in square brackets are optional): UPDATE <table> SET <column i> = <expression i>, . . . , <column j> = <expression j> [WHERE <condition> ]; If you want to change or modify a column s values for all the rows in the table, you use an UPDATE statement without a WHERE condition: SQL> UPDATE persons SET salary=salary*0.10; If you want to modify only some rows, you need to use the WHERE clause in your UPDATE statement: SQL> UPDATE persons SET salary = salary * 0.10 WHERE review_grade > 5;

The WHERE clause in a SELECT, INSERT, DELETE, or UPDATE statement lets you filter data. That is, you can restrict the number of rows on which you want to perform a SQL operation. Here s a simple example: SQL> INSERT INTO a SELECT * FROM b WHERE city='DALLAS';

Frequently, you ll have to sort the results of a query in some order. The ORDER BY clause enables you to sort the data based on the value of one or more columns. You can choose the sorting order (ascending or descending) and you can choose to sort by column aliases. You can also sort by multiple columns. Here s an example: SQL> SELECT employee_id, salary FROM employees ORDER BY salary;

Entries can be added to the /etc/inittab file at any time, but init won t automatically reread the inittab file when it is modified. You can manually cause such a rereading by issuing the init q command as root, which will reread the file and implement the current configuration. One potential issue to watch for if you create a respawn inittab entry is that the script to be called should include code enabling it to run continuously. If you create a script that performs a monitor function and exits when finished, init will assume the program is constantly dying and continuously try to restart the process. On most systems, if this happens you will start receiving messages in the system logs warning you that the process is

Be default, an ORDER BY clause sorts in ascending order. If you want to sort in descending order, you need to specify the DESC keyword: SQL> SELECT employee_id, salary FROM employees ORDER BY salary desc;

Understanding the dependency between the C/C++ runtime and the managed compilation options is important because all linker inputs must either use the CRT in a consistent way or be independent of the CRT. You cannot combine linker inputs that have been compiled with different compiler switches for the CRT. If the project you want to migrate uses the DLL variant of the CRT already, there is no need to reconfigure that part of your project. When this is not the case, you have to touch all linker inputs that depend on the CRT. These linker inputs can either be object files or static libraries. To ensure that your object files don t cause trouble, compile all of them with /MD[d]. To ensure that the correct variants of static libraries are used, you have to modify the linker settings. Usually, all linker inputs except import libraries for DLLs depend on the CRT. Therefore, switching the CRT dependency can be a certain amount of work. If the static libraries your project depends on do not exist in variants that depend on the DLL variant of the CRT, you should leave your project as a native project and provide managed code extensions via a mixed-code DLL that you call from your native project.