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Query: SELECT id, name, FROM users u WHERE **id <> 0** LIMIT 50 OFFSET 0
What does the clause id <> 0 mean here? Does it mean:
id is less than zero or id is greater than zero
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“Every [SQL] data type includes a special value, called the null value,”0 “that is used to indicate the absence of any data value”.1. The null value does not indicate why a value is absent—it simply marks the places that do not have a data value.
<> is standard ANSI SQL and stands for not equal or !=
In terms of performance , the two queries almost the same. if you can check the actual execution plan in SQL Server, there is no difference of the two query. NOT is a negation and the other (<>) is an operator used for comparison.
Not Equal Operator: != Evaluates both SQL expressions and returns 1 if they are not equal and 0 if they are equal, or NULL if either expression is NULL. If the expressions return different data types, (for instance, a number and a string), performs type conversion.
SELECT * FROM MARKS; Output: Step 6: Display all the rows of the MARKS table ignoring the 0(zero) values. This is achieved through REPLACE command which replaces all 0's with an empty blank.
Examples of Bit Column The converting string values TRUE and FALSE results in 1 for TRUE & 0 for FALSE. Converting any other strings results in an error.
<> means "not equal" (it can also be written as != with some DBMS)
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