Once a DDL statement is executed, it takes effect immediately in the database. Which means any changes done to the database using DDL command is permanent. Popular DDL commands are: CREATE, DROP, ALTER and TRUN
which covers the majority of SQL statements. It’s the part of the SQL statement that regulates who has access to the data and the database. DCL statements are grouped together with DML statements. The DML command is not auto-committed, which means it cannot ...
Retail Client means a client who is not a professional client; RQFII means a Renminbi qualified foreign institutional investor approved pursuant to the relevant PRC regulations (as amended from time to time). In loco parentis means relating to the responsibility to undertake the care and control of...
Ever encounter bosses who couldn't make up their minds about certain business decisions? What about working in a company that is competing head-to-head with another company providing the same service? To IT departments, this means frequent code changes a
/ -- means it is an absolute path to a file. Otherwise, path is considered relative to the current working directory. This usually behaves the same as ~/, but can be different in some edge-cases (ie. if $[cd /some/other/path] is at the top of the file)Combining...
A Transaction Control Language (TCL) is a computer language and a subset of SQL, used to control transactional processing in a database. A transaction is logical unit of work that comprises one or more SQL statements, usually a group of Data Manipulation Language (DML) statements. Transaction...
The screenshots from sql-server : your students table has a composite primary key, so the foreign key must include all of them...What is javascript:;? In some sites I noticed the following href: I'm interested in what javascript:; means? Is it the same as javascript:void(0)? javascrip...
A new property, TraceLogMaxWidth, has been added to most of the libraries to provide a means of reducing the size of log files when the large messages are used. The data of a message body is logged in a single line. You are able to configure a maximum number of characters per output...
(We use stored procedures because, as the introductory post shows, using single SQL statements turns our database benchmark into a network test). So instead we are going to take a cut down version of the HammerDB TPROC-C driver script and do the same in Python and use the HammerD...
The term "expression" used in the bullet points below means any SQL scalar expression or literal other than a column value. Note that if X and Y.Z are a column names, then +X and +Y.Z are considered expressions.</P> <UL> <LI><P>When a column value is compared to the result of...