Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
2018-12-04 {\x22visitorId\x22: null, \x22pageSize\x22: 36, \x... 2018-12-04 i \x63\x61nt ti\x65n ti\x65n 2018-12-04 \x2f\x01\x69\163\151\x62\x69\154it\171 2018-12-04 \x65m ko th\x65 \.
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 field.
SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table and return all of them. Another Example: ' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--. UNION – Fixing Language Issues.
Union select null, null, null, null, null, null -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)
The Oracle IS NOT NULL condition is used to test for a NOT NULL value.
In R language, NULL … Continue reading R null values: NULL, NA, NaN, Inf.