267. convert the NULL values with empty string by wrapping it in COALESCE. SELECT CONCAT(COALESCE(`affiliate_name
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...
However, it does skip any NULL values after the separator argument.
1' UNION SELECT @--+ #The used SELECT statements have a different number of columns 1' UNION SELECT
Now, if I do: SELECT CONCAT(FirstName, LastName, Email) as Vitals FROM MEMBERS.
SELECT m.id, m.name, m.description, m.directions, COUNT(j.markerid) as marker_jingles FROM markers AS m LEFT OUTER JOIN jingles AS j ON j.markerid=m.id WHERE 1. But am a bit stuck because I cannot figure out how to get it to return rows when the COUNT is 0.
UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a
Синтаксис: 0xHEX_ЧИСЛО (SM): SELECT CHAR(0x66) (S) SELECT 0x5045 (это не число, а строка) (M) SELECT 0x50 + 0x45 (теперь это число)
Функция CONCAT предназначена для сложения строк при выборке из базы данных. Строками обычно выступают поля таблиц.
returns non null values in group */ SELECT COUNT(Col1) FROM ##TestData; Because of this, COUNT, DISTINCT, and NULLs have a