Почти полляма (с пошлиной)
Не одна такая...
Пара овощетичисток и ага...
Случайно наткнулся на маркетплейсе. (Да простят меня ладалюбители. Просто сравнил... Ничего личного).
Почему и зачем там есть такие лоты?
Example Answer Structure
Question: What value will the following query return?
SELECT COUNT(*) FROM TMP_TABLE;
Answer:
To determine the result of the query SELECT COUNT(*) FROM TMP_TABLE;, we need to understand what the COUNT(*) function does in SQL. The COUNT(*) function counts the number of rows in a table, regardless of whether they contain NULL values or not.
Let's look at the data in the table TMP_TABLE:
column1column21212NULL131214NULLNULL1315
There are 5 rows in the table. The COUNT(*) function will count all these rows, including those with NULL values.
Therefore, the query:
SELECT COUNT(*) FROM TMP_TABLE;
will return the value 5.
This value is the total number of rows in the table TMP_TABLE, without any consideration of the content of the columns or whether they contain NULL values.
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