Is blank space is NULL?
A NULL value is not same as zero or a blank space. A NULL value is a value which is ‘unavailable, unassigned, unknown or not applicable’. Whereas, zero is a number and blank space is a character.
Does space count as NULL in MySQL?
yes, Empty means it we are passing a null value. so it take spaces. In MySQL, stored int a TEXT datatype, an empty (zero length) string is different than a NULL value.
Is space considered as NULL in Oracle?
The Oracle database does not support empty string values in text columns. Instead, the Oracle database treats these values as NULL values. Before writing values into fixed-size text columns, the Oracle database pads all non-empty values with space characters. … In the table, an en dash (-) represents a space character.
IS NULL same as 0 or blank space?
Blank (or space) is a character. Zero is a number. Null means “no value”.
What is the difference between NULL and empty space?
What is the difference between NULL and Blank ? … Null can be a unknown value or an absence of a value, where as an Empty or Blank string is a value, but is just empty. Null can be used for string , Integer ,date , or any fields in a database where as Empty is used for string fields.
What is better NULL or empty?
In innoDB, NULL occupies less space as compared to empty string. Also, the NULL length is null while length of the empty string is 0. … So it is better to use empty string for database as allowing NULL value forces the system to do extra work and does not give the data that you are looking for.
Is it better to use NULL or empty string?
If an empty string is a valid value for the field in question, then expect it and code for it; if not, use null.
IS NULL THEN 0 in MySQL?
IFNULL() returns a numeric or string value, depending on the context in which it is used. You can use coalesce(column_name,0) instead of just column_name . The coalesce function returns the first non-NULL value in the list.
IS NULL replace SQL?
We can replace NULL values with a specific value using the SQL Server ISNULL Function. The syntax for the SQL ISNULL function is as follow. The SQL Server ISNULL function returns the replacement value if the first parameter expression evaluates to NULL.
IS NULL or 0 SQL?
In SQL Server, NULL value indicates an unavailable or unassigned value. The value NULL does not equal zero (0), nor does it equal a space (‘ ‘). Because the NULL value cannot be equal or unequal to any value, you cannot perform any comparison on this value by using operators such as ‘=’ or ‘<>’.
Should I use NULL in database?
NULL values are used to indicate that you could have a value, but you don’t know what that value should be yet. They are placeholders until you finally collect the data needed to fill the table field with a real value. You should never confuse NULL values for zeros or blank strings.
What is the difference between NULL and blank space in a specific field of the table?
Answer: Null indicates there is no value within a database field for a given record. … Blank indicates there is a value within a database but the field is blank.