As @Prdp noted, the answer is RDBMS-specific. What is specific is whether the server treats a zero-length string as being equivalent to NULL, which determines whether concatenating a NULL yields a NULL or not. Generally COALESCE is most concise for PostgreSQL-style empty string handling, and...
You can't select the values from the table when the row count is 0. Where would it get the values for the nonexistent rows? To do this, you'll have to have another table that defines your list of valid Project and Financial_Year values. You'll then select from this table, perform a left join on your existing table...
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...
Синтаксис функции COUNT: SELECT COUNT(expression) FROM table WHERE predicates; Функция COUNT принимает один из нескольких параметров
SELECT AVG(column_name) FROM table_name WHERE condition; SUM() Syntax.
like we see [select] is down let's double text [Replacing keywords] like this SeLselectECT.
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
...labor op99999' union select unhex(hex(version())) -- 'x'='x labor op99999' union select unhex(hex(version())) -- 'x'='x.
Вы можете использовать функцию CONCAT в команде SELECT, объединить значения из нескольких столбцов и отображать их. Следующий пример сочетает в себе имя и отдел (только для отображения), как показано ниже.
I have the following query that may return null if certain dates are selected, I want to display 0 instead of a blank but cannot figure it out: * I removed the date code to make it easier. SELECT ISNULL(COUNT(*), '0') AS thecount. FROM dbo.table1.