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The column definitions of a table can be modified using the ALTER TABLE command.
ALTER TABLE employee
MODIFY emp_name varchar2(100) not null;
This command makes the emp_name as a not null column and a alpha numeric column of 100 characeter width
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In SQL what does the 'INSERT INTO' statement mean?
IN SQL, the statement 'INSERT INTO' means to insert single or multiple records into a table. There are two possible ways to write the 'INSERT INTO' statement. The first way does not specify column names and only specifies the values. The second way specifies both the column names and the values.
Sql select to return one value?
It depends on the DBMS MSSQL: SELECT TOP 1 column FROM table MySQL: SELECT column FROM table LIMIT 0,1 (start index, number of rows to get)
What are the parts of a basic SQL query?
The basic parts of a SQL Select query are: SELECT column names FROM table name WHERE conditions ORDER BY column names The basic parts of an insert query would be: INSERT INTO table name (VALUES) The basic parts of a delete query would be DELETE FROM table name WHERE conditions The basic parts of an update query would be UPDATE TABLE table name SET column name = value WHERE conditions
What are SQL data types used for?
There are many purposes behind 'SQL' data types. The most common use of 'SQL' is with website programming and hosting services, as well as HTML coding.
How to define a user defined function in SQL?
Not possible in SQL, but possible in many vendor-specific SQL-based languages like Oracle PL/SQL.
How do you concatenate char with int column in sql?
In MS SQL, you can use the char() operator on the column. For example: select 'some string content ' + char(integer_field) from my_table
What symbol is used to qualify column names in sql?
(.) Period
What is the unsupported length of the column?
Length over which the column has no support is taken as unsupported length of the column
Use what to change uneven columns into more equal length?
column breaks
Under a column how many bytes for a TITLE in SQL Datrabase?
1 byte
How do you copy column heading in oracle sql developer?
Shift + cntrl + c
What does the SQL Max function do?
The "SQL Max function" is a computer programming term, which can be used in spreadsheets to give the highest value from the currently selected column.
Feature of rdbms?
It stores data in tables. Tables have rows and column. These tables are created using SQL. And data from these tables are also retrieved using SQL
How do you calculate column volume?
Multiply column inside diameter by the column's length. Then convert to units you need. The above is not correct.The volume of a column is the circular area of the column multiplied by the length, pi*radius^2*length.
What is the column length column to column of the Great Wall of China?
5 inches
What purpose does SQL inserts serve?
The purpose of a SQL inserts serve as allowing you to add data, for example a chart or a column afterwards. It works to hold the place for potential future data information.
Why is the length of air column increased slowly?
The length of the air column is usually increased slowly because of resonance.
