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- SQL.How can you compare two nullable values safely, and how does IS DISTINCT FROM differ from <>?
- SQL.How are NULL values ordered by ORDER BY, how do defaults differ between databases, and how can you control their placement?
- SQL.How does NULL propagate through arithmetic expressions, and how can COALESCE and NULLIF help handle missing values and division by zero?
- SQL.How does NULL affect join conditions, and why can filtering the right-hand table in WHERE remove unmatched rows from a LEFT JOIN?
- SQL.How do GROUP BY and DISTINCT treat NULL values, even though NULL = NULL evaluates to UNKNOWN?
- SQL.How do aggregate functions handle NULL, and what is the difference between COUNT(*), COUNT(column), and COUNT(DISTINCT column)?
- SQL.How does NULL affect IN and NOT IN, and why can NOT EXISTS be a safer choice when a subquery returns nullable values?
- SQL.How do WHERE, HAVING, and CHECK constraints treat conditions that evaluate to UNKNOWN?
- SQL.Why do column = NULL and column <> NULL not work as expected, and when should you use IS NULL and IS NOT NULL?
- SQL.What is SQL’s three-valued logic (TRUE, FALSE, UNKNOWN), and how do AND, OR, and NOT behave with UNKNOWN?
- ChromeDevTools.Watch all failed requests
- SQL.What are domain types (or constraints on data types), and how do they help enforce data correctness?
- SQL.How does SQL handle comparisons between different data types (for example, string vs number), and why is this dangerous?
- SQL.What is the difference between DATE, TIME, TIMESTAMP, and TIMESTAMPTZ, and which one should be used for business events?
- SQL.How do numeric types like INTEGER, BIGINT, DECIMAL, and FLOAT differ in terms of precision and use cases?
- SQL.What problems can arise from implicit type casting in SQL, and how can it affect indexes?
- SQL.How does NULL differ from 0, an empty string, or FALSE in SQL?
- SQL.What is the difference between CHAR, VARCHAR, and TEXT, and when would you choose each?
- SQL.What is MVCC ?
- SQL.What is AutoVacuum Postgres ?
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Category Archives: javascript
JS. Цикл while. Eдим мороженное
Небольшая иллюстрация цикла WHILE в JS… Едим мороженное.
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<head> <!--Включаем юникод кодировку, чтобы программа понимала русский --> <meta name="http-equiv" content="Content-type:text/html" charset="UTF-8"> </head> <script> var IceCreamNumber,EatenIcecreams; EatenIcecreams=0; document.write('<h2>Hello this is JS and while cycles example</h2>'); document.write('<p>Author Panteleev Stanislav 12.12.2015 Welcome to http://digital-flame.ru</p>') //Спрашиваем сколько съесть IceCreamNumber=prompt('Сколько мороженного хотите съесть?',''); //Едим while (IceCreamNumber>0){ EatenIcecreams=EatenIcecreams+(IceCreamNumber-(IceCreamNumber-1)); document.write('eating ice cream number '+EatenIcecreams+'<br>'); IceCreamNumber--; }; //Проверяем число съеденного мороженного if (IceCreamNumber==0){ document.write('<br><h2>WOW!!! I have eaten '+EatenIcecreams+' Ice Creams<h2>'); }; </script> |
Результат работы скрипта
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innerText | outerText | innerHTML | outerHTML
Полной загадкой для меня была эта абра-кадабра – “innerText | outerText | innerHTML | outerHTML” – решил в ней разобраться. Как бы ничего сложного, но нюансы, нюансы, которые и показывают, что на самом деле не понимаешь тему, а только думаешь, … Continue reading
Posted in Delphi, javascript, Без рубрики
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