select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database.
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
select number, text from test_table union select number, text from test_table_2. Как Вы видите, вывелось всего 5 строк, так как у нас первая строка в первом запросе и первая строка во втором запросе одинаковые, поэтому они объединились. Теперь давайте объединим через union all.
Best Result For : 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as char cAsT
Best Result For : 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as char --. تفسير فرط السبحة في المنام.
UNION ALL Syntax. The UNION operator selects only distinct values by default.
Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types. What is the difference between UNION and UNION ALL?
SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table and return all
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