The DBMS must include concurrency control software to ensure that several users trying to update the same data do so in a controlled manner so that the result of updates is correct. …… A fundamental role of multiuser DBMS software is to ensure that concurrent transactions operate correctly . ...
This course Fundamentals of Database will cover the basics of DBMS which includes What is a Database ?What is SQL ?, Features and Applications of SQL, Who is a SQL Developer, Roles and Responsibilities of a SQL Developer etc. By the end of this Course you will have a clear understanding...
Joins come in several flavors. In the SQL statement, the first table (usually calledTable Aor theLeft Table) joins to the second table (usually calledTable Bor theRight Table) in a position-aware manner. Thus, if you change the order of the tables in the join statement, the results of ...
SQLINTEGER ValueLen;// Call local function to place data in ValuePtr. In ValueLen, return the// number of bytes of data placed in ValuePtr. If there is not enough// data, this will be less than 50.FillBuffer(ValuePtr, sizeof(ValuePtr), &ValueLen);// Call SQLPutData to send the...
The computer has units of speed in microsecond, nanosecond, and even the picosecond. It can perform millions of calculations in a few seconds as compared to man who will spend many months to perform the same task.AccuracyIn addition to being very fast, computers are very accurate. The calcul...
You cannot use single-line comments in a PL/SQL block that will be processed by an Oracle Precompiler program because end-of-line characters are ignored. As a result, single-line comments extend to the end of the block, not just to the end of a line. In this case, use the/* */no...
You can use multi-line comment delimiters to comment-out whole sections of code, as the following example shows: /*LOOPFETCH c1 INTO emp_rec;EXIT WHEN c1%NOTFOUND;...END LOOP;*/ Restrictions You cannot nest comments. Also, you cannot use single-line comments in a PL/SQL block that wil...
Fundamentals of Science & Technology - Quick Guide Previous Next Science & Technology - Introduction The evolution of science is like a boon to the world, as human beings come to know a lot about the world they are living in including the activities they indulge into. Furthermore, the...
Fundamentals of Databases: Client-Server Databases Database Servers These SQL Servers can be accessed in two ways Via clients (e.g. phpMyAdmin, Office Access) Via requests (SQL) Clients have lots of tools built in for handling data in a database Creating tables Inserting records Deleting tables...
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