TCL full form: Know what is the full form of TCL and its meaning. TCL commands are used for managing and controlling the transactions in a database and the changes made by the DML.
DML (Data Manipulation Language) are SQL commands focused on handling data within the database, including most SQL statements. Let's look at some DML commands with a simple example for each command. i. INSERT INTO In SQL, theINSERT INTOstatement is used to insert new rows into a database ...
such as creating tables, inserting data, querying information, and controlling access and security. SQL commands can be categorized into different types, each serving a specific purpose in the database management process.
Commit, rollback and savepoint are the commonly used TCL commands. Transaction Control Language(TCL) commands are used to manage transactions in database. These are used to manage the changes made by DML statements.
SQL is an open-source data management system. The SQL query is used to retrieve and manipulate the data from the table. With the help of SQL commands, we can query, filter, sort, join, group and modify the data in the database. SQL Commands SQL commands are categorized into 5 ...
In this section, we will be discussing types of SQL commands. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL. Each category is further explained below: 1. Data Definition Language(DDL): The Data Definition Language is made up of SQL commands that can...
SQL commands are instructions to the database to perform a specific operation. For example, you can use SELECT command to read the data from database, you can use UPDATE command to update data in database. There are several commands that are available in
The "eval" method described above keeps a cache of prepared statements for recently evaluated SQL commands. The "cache" method is used to control this cache. The first form of this command is:dbcmd cache size N This sets the maximum number of statements that can be cached. The upper ...
The tutorial is intended as a companion to the Tcl manual pages which provide a reference for all Tcl commands. Read the tutorial 4. Learn Tcl in Y Minutes by Poor Yorick This is an excellent walkthrough and cheatsheet. Read the document ...
info commands info commands pattern 如果不给出模式,返回所有的命令的列表,内建和自建的. 模式是用 C Shell 匹配风格写成的. info complete command 检查名是否完全,有无错误. info default procname arg varname procname 的参数 arg,是否有缺省值. info exists varName 判断是否存在该变量. info globals ...