Зарубежные исполнители на букву 999999.9' union all select 1,2,999,4,5,6,7,8,9 and '0'='0. Вы можете ознакомиться с размещенными песнями и сами добавить песни в данные категории исполнителей.
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.
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 really do need it to be null.
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The CAST() function converts a value (of any type) into a specified datatype.
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...
When the CAST or CONVERT functions output a character string, and they receive a character string input, the output has the same collation and collation label as the input.
Dataframe consisting of NULL values for each of the column will presented as dataframe with 0 observations and 0