Қазақстан ғылымының дамуы мен келешегі жастар көзімен - 2018
26 янв. 2018 г. ... create table AUDIT_LOG. ( audit_log_id. NUMBER not null, audit_tables_id NUMBER, audit_columns_id NUMBER, change_type. VARCHAR2(10), audit_date.
ХАБАРШЫ ВЕСТНИК
extrem.name = = null мәні true мәнін қайтарады, егер extreme объектісінде name қасиеті жоқ болса. ... - технологиялық даярлық. Мотивация деп тұлғаның мінез- ...
Заметка про NULL / Хабрахабр
Даже выражение NULL != NULL не будет истинным, ведь нельзя однозначно сравнить одну неизвестность с другой.
Making ORDER BY NULLS FIRST / LAST use indexes at EXPLAIN...
CREATE INDEX t_null_orderer ON t_null (orderer) /. INSERT INTO t_null SELECT level, DECODE(level, 1, NULL, level) FROM dual CONNECT BY.
SQL is null and = null - Stack Overflow
Possible Duplicate: what is “=null” and “ IS NULL” Is there any difference between IS NULL and
sql - WHERE all IS NOT NULL - Stack Overflow
You'll have to explicitly state the condition on each column, so e.g. SELECT * FROM schedule WHERE id IS NOT NULL AND foo IS NOT NULL AND bar IS NOT NULL; -- and so on..
Ask TOM "HOW CAN I COMPARE NULL VALUES"
if user inputs NULL then this query will return no records. is there any way to consider NULL = NULL for this query? Followup.
COUNT inside UNION ALL leads to skipping expected resul
union all select distinct article_id, NULL, NULL, NULL from articles.
ORACLE-BASE - NULL-Related Functions
Remember, comparisons against null always result in null, so queries can't use regular comparison operators like "=" or "!=". SQL> SELECT * FROM null_test_tab WHERE col1 = NULL ORDER BY id; no rows selected.
Using NOT IN operator with null values | SQL Bad Practices
-- By default ANSI_NULLS is off so null comparisons follows the SQL-92 standard.
10 things in MySQL that won’t work as expected - DZone Database
#10. Searching for a NULL. SELECT * FROM a WHERE a.column = NULL. In SQL, a NULL is never equal to anything, even another NULL. This query won’t return anything and in fact will be thrown out by the optimizer when building the plan.