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SQL Select top, limit, fetch first rows only, rownum

MySQL supports the LIMIT clause to select a limited number of records, while Oracle uses FETCH FIRST n ROWS ONLY and ROWNUM. SQL Server / MS Access Syntax: SELECT TOP number|percent column_name(s) FROM table_name WHERE condition

MySQL :: MySQL 8.0 Reference Manual :: 12.8 String Functions and...

1 row in set (0.00 sec). By default, CHAR() returns a binary string. To produce a string in a given character set, use the optional USING clause

SQL Injection - HackTricks

In some situations, an attacker can escalate an SQL injection attack to compromise the underlying server or other back-end infrastructure, or perform a denial-of-service attack.

SQL injection UNION attacks | Web Security Academy

This results in a SQL injection UNION attack. The UNION keyword lets you execute one or more additional SELECT queries and append the results to the original query. For example: SELECT a, b FROM table1 UNION SELECT c, d FROM table2.

SQL Инъекции | ANTICHAT - Security online community | Forum

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Incorrect syntax near the keyword 'with'. If this statement is a common...

Сообщение 319, уровень 15, состояние 1, строка 10 If this statement is a common table expression or an xmlnamespaces clause, the previous statement must be terminated with a semicolon. Если этот оператор является обычным табличным выражением или предложением xmlnamespaces...

PostgreSQL return default row on empty result set - Database...

Easy solution would be to have a CTE or subquery with UNION and LIMIT 1, but the query should be able to return multiple values (key column may contain duplicates), so this is not a solution.

sql server - Check If sp_send_dbmail Was Successful - Stack Overflow

mysql - mysql grouping data into a row or cross query

Hint here here (eng). The bottom line is that with a purely query you cannot select a dynamic number of fields, but you can glue the query itself using mysql tools.

How to hide rows with zeros or nulls when measures are dynamically...

But I'm asked to remove the lines that are all in zeros and/null, so the dashboard only shows the ones that contains amounts, depending on the measure/s selected.