select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
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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...
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation!
I would like to have a list of those columns of a table that have at least one not-NULL data entries in them. In other words, I would like to get the column names for which the following returns at least one...
SQL’s NULL indicates absent data. NULL propagates through expressions and needs distinct comparison operators.
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In R language, NULL … Continue reading R null values: NULL, NA, NaN, Inf.
NULL is a special value that signifies 'no value'. Comparing a column to NULL using the = operator is undefined. Instead, use WHERE IS NULL or WHERE