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
So far we have discussed all the five categories of SQL Commands i.e DCL, DML, DDL, TCL and DQL and it’s subtypes. We’ve gone through each command in detail with its syntax and example that will assist you in writing queries. The SQL commands’ allows you to construct and manipulate...
All this information can be modified later using DDL commands. Table Naming Conventions - The name you choose for a table must follow these standard rules: The name must begin with a letter A-Z or a-z Can contain numbers and underscores Can be in UPPER of lower case Can be up to 30 ...
Truncate statement syntax is: TRUNCATE TABLE table_name; For example: TRUNCATE TABLE Employee; In this example, we’re marking all the extents of the Employee table for deallocation, so they’re considered empty for reuse. Other statements Other commonly used commands include RENAME and COMMENT. ...
CREATE PROCEDURE creates a stored procedure.Function creation also applies to stored procedures. For details, see CREATE FUNCTION.The precision values (if any) of the par
I’ve had a number of questions in relation to DDL support for Automatic Indexes since my last post on how one can now drop Automatic Indexes, so decided to quickly discuss what DDL statements are supported with Automatic Indexes. Many DDL commands are NOT supported with Automatic Indexes, suc...
A sequence cannot be created in the template1 database. Syntax CREATE SEQUENCE name [ INCREMENT [ BY ] increment ] [ MINVALUE minvalue | NO MINVALUE | NOMINVALUE ] [ MAXVALUE maxvalue | NO MAXVALUE | NOMAXVALUE] [ START [ WITH ] start ] [ CACHE cache ] [ [ NO ] CYCLE | NOC...
CREATE SEQUENCE adds a sequence to the current database. The owner of a sequence is the user who creates the sequence.A sequence is a special table that stores arithmetic