Firebird SQL：在查询文本中传递多行数据

Question

is it possible to use an array of elements as a select statement? I know it is possiible to get rows based on static elements like this:

SELECT 405, CAST('4D6178' AS VARCHAR(32)), CAST('2017-01-01 00:00:00' AS TIMESTAMP) FROM rdb$databas

That will give you a table select with one row. Now I would like to get this as table with n rows, but I don't know how to achieve this. Due to the fact that firebird doesn't allow multiple select statements I cannot only append n times a selec.

Info : Firebird 2.1

Answer 1

Use UNION ALL clause.

https://en.wikipedia.org/wiki/Set_operations_(SQL)#UNION_operator

Select x,y,z From RDB$DATABASE
    UNION ALL
Select a,b,c From RDB$DATABASE
    UNION ALL
Select k,l,m From RDB$DATABASE

Notice however that this should only be used for small data. Firebird query length is limited to 64KB and even if that would not be so - abusing this method to inject lots of data would not be good.

If you really need to enter lot of similar (same structure) data rows - use Global Temporary Tables

The following discussion hopefully would give you more insights: https://stackoverflow.com/a/43997801/976391