Operator Description Less than Greater than Less than or equal to Greater than or equal to Equal Not equal Not equal (non-standard but popular syntax) The The statement shown above is equivalent to the following statement: SELECT 3 >= 2 AND 3 <= 6; To
test if a value does not fall within the specified range use SELECT 3 NOT BETWEEN 2 AND 6; The statement shown above is equivalent to the following statement: The presence of NULL in a SELECT NULL BETWEEN 2 AND 4; -- null SELECT 2 BETWEEN NULL AND 6; -- null The SELECT 'Paul' BETWEEN 'John' AND 'Ringo'; -- true Note that the value, min, and max parameters to IS NULL and IS NOT NULL#The Using select NULL IS NULL; -- true But any other constant does not: SELECT 3.0 IS NULL; -- false IS DISTINCT FROM and IS NOT DISTINCT FROM#In SQL a SELECT NULL IS DISTINCT FROM NULL; -- false SELECT NULL IS NOT DISTINCT FROM NULL; -- true In the example shown above, a The following truth table demonstrate the handling of
GREATEST and LEAST#These functions are not in the SQL standard, but are a common extension. Like most other functions in Presto, they return null if any argument is null. Note that in some other databases, such as PostgreSQL, they only return null if all arguments are null. The following types are supported: Returns the largest of the provided values. least(value1, value2, ..., valueN) → [same as input]#Returns the smallest of the provided values. Quantified Comparison Predicates: ALL, ANY and SOME#The expression operator quantifier ( subquery ) For example: SELECT 'hello' = ANY (VALUES 'hello', 'world'); -- true SELECT 21 < ALL (VALUES 19, 20, 21); -- false SELECT 42 >= SOME (SELECT 41 UNION ALL SELECT 42 UNION ALL SELECT 43); -- true Here are the meanings of some quantifier and comparison operator combinations:
LIKE#The LIKE operator is used to match a specified character pattern in a string. Patterns can contain regular characters as well as wildcards. Wildcard characters can be escaped using the single character specified for the ESCAPE parameter. Matching is case sensitive. Syntax: expression LIKE pattern [ ESCAPE 'escape_character' ] if
Examples: SELECT * FROM (VALUES ('abc'), ('bcd'), ('cde')) AS t (name) WHERE name LIKE '%b%' --returns 'abc' and 'bcd' SELECT * FROM (VALUES ('abc'), ('bcd'), ('cde')) AS t (name) WHERE name LIKE '_b%' --returns 'abc' SELECT * FROM (VALUES ('abc'), ('bcd'), ('cde')) AS t (name) WHERE name LIKE 'b%' --returns 'bcd' SELECT * FROM (VALUES ('abc'), ('bcd'), ('cde')) AS t (name) WHERE name LIKE 'B%' --returns nothing SELECT * FROM (VALUES ('a_c'), ('_cd'), ('cde')) AS t (name) WHERE name LIKE '%#_%' ESCAPE '#' --returns 'a_c' and '_cd' SELECT * FROM (VALUES ('a%c'), ('%cd'), ('cde')) AS t (name) WHERE name LIKE '%#%%' ESCAPE '#' --returns 'a%c' and '%cd' Which operator compares if one value is not equal to another value?The not-equal-to operator ( != ) returns true if the operands don't have the same value; otherwise, it returns false .
Which operator is used to compare the operands are equal to or not?The == and != operators check if their operands are equal or not.
What is != and !== in Javascript?==) The strict inequality ( !== ) operator checks whether its two operands are not equal, returning a Boolean result.
Which comparison operator means not equal to in SQL?SQL Not Equal Operator: !=
The SQL Not Equal comparison operator (!=) is used to compare two expressions. For example, 15 != 17 comparison operation uses SQL Not Equal operator (!=) between two expressions 15 and 17.
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