mysql - Site has been hacked via SQL Injection - Stack Overflow
5 янв. 2011 г. ... If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate ...
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sql injection "union select null" - CodeProject
Union select null, null, null, null, null, null, null from information_schema.tables.
null - IN с NULL или NULL - Qaru
Ввод нулевого значения будет сжиматься до field=null, который не будет работать. (Comment Marc B). Я сделал бы это для clairity. SELECT * FROM tbl_name WHERE (id_field IN ('value1', 'value2', 'value3') OR id_field IS NULL).
Команда IS NOT NULL - проверка поля на не NULL | Трепачёв...
IS NULL значение равно NULL. Группировка.
SQL using If Not Null on a Concatenation - Stack Overflow
If I have the table … This will display Firstname-Middlename-Surname e.g. … The second one (Jane’s) displays correct, however since John doesn’t have a middlename, I want it to ignore the second dash.
Play 999999 9 30000UNION ALL SELECT NULL NULL... - Play161.com
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sql server - Why does COUNT() aggregate return 0 for 'NULL'?
A SELECT statement returns several rows: … I get 47 rows that have 'NULL' for ColA within TableA. … If I add an aggregate to this query: … I get … Why is this happening, and what can I do to avoid this?
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В ответ на поисковый запрос «999999 9 union all select null select concat 0x7e 0x27
Использование значения NULL в условиях поиска | Интерактивный...
Case Unknown Null предикат IS Null. Предыдущая [Предикат Like].