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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.
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as opt however, I don't want an empty string, I
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...
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
Union select null, null, null, null, null, null -- test all nulls --*/ ). A.
Dataframe consisting of NULL values for each of the column will presented as dataframe with 0 observations and 0 variables (0 columns
SELECT CAST (miles AS INT) FROM Flights -- convert timestamps to text INSERT INTO mytable (text_column) VALUES (CAST (CURRENT_TIMESTAMP AS VARCHAR(100))) -- you must cast NULL as a data type to use it SELECT airline FROM Airlines UNION ALL...
A value of null means that the value is unknown, undefined, or uninitialized. Null values can arise when you refer to message fields that do not exist, access database columns for which no data has been supplied, or use the keyword NULL, which supplies a null literal...
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database.