SQLite：查询分区表

Question

I have 100 tables with >1M records in each. All tables differ by names but have identical structure:

 (valueX INT NOT NULL, valueY INT NOY NULL, valueZ INT NOT NULL).

All table names are listed in separate table NAMES(name TEXT NOT NULL) but due to SQLite limitations table name cannot be substituted in query as a variable.

I want to search in all tables rows where valueX > valueZ AND valueZ < valueY while skipping first N and retrieving next K rows.

I prefer not to waste disk space and/or memory, since I believe they may be not enough. That's effectively eliminates the UNION option I guess.

What can be done - considering the constraints?

PS. By "What can be done" I express my will to learn about proper strategy and to see a sample of relevant query.

PPS. Number of tables can change anytime.

Answer 1

如果可能的话，SQLite将进行子查询拼合 ，因此，将表与UNION ALL （最好在视图中）简单组合并对其进行查询不会对磁盘​​/内存造成任何影响。