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How to set in SQL a where condition that is always true?
As far as I know: where 1=1, are there other ways too?
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Some common SQL injection examples include: Retrieving hidden data, where you can modify an SQL query to return additional results. Subverting application logic, where you can change a query to interfere with the application's logic. UNION attacks, where you can retrieve data from different database tables.
This means that if ConditionMet(data) is true, then only return rows where AccountID matches the AcctId you are passing in. If it is false, then return all rows.
The SQL WHERE clause is used to specify a condition while fetching the data from a single table or by joining with multiple tables. If the given condition is satisfied, then only it returns a specific value from the table. You should use the WHERE clause to filter the records and fetching only the necessary records.
The condition 1=0 can be used to stop the query from returning any rows. It returns empty set.
Are you, by chance, talking about collapse conditions, where a grouped condition is always TRUE or FALSE?
WHERE TRUE
WHERE 1
WHERE <string value> = <the same string value>
WHERE <numeric value> = <the same numeric value>
WHERE <hardcoded formula> = <the same hardcoded formula or one that produces the same value>
WHERE NULL IS NULL
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