select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this
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Sql Injection Using Null Query (Oracle injection).
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For grouping, ClickHouse interprets NULL as a value, and NULL=NULL.
...'null''''null''''null''''null''''null'' ''null''''null''''null''''null''''null''''null''''null''''null''''null''''null''''null''''null'' ''null''''null''''null''''null''''null''''null''''null''''null''''null''''null''''null''''null'' ''null''''null'''null''''null''''null''THE NULL''null''''null''''null''''null''''null''.
Comparing a column to NULL using the = operator is undefined. Instead, use WHERE IS NULL or WHERE IS NOT NULL. The definitive guide for data professionals.
In general, R supports: NULL NA NaN Inf / -Inf NULL is an object and is returned when an expression or function results in an undefined value.