SQL Dummy Needs Help
От | Alder |
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Тема | SQL Dummy Needs Help |
Дата | |
Msg-id | 3aa9287b@obsidian.gov.bc.ca обсуждение исходный текст |
Ответы |
Re: SQL Dummy Needs Help
Re: SQL Dummy Needs Help Re: SQL Dummy Needs Help |
Список | pgsql-sql |
I'm pretty new to SQL and can't figure out how to write what should be a simple query of two tables. Could someone here possibly help me out? Table 1 has two fields I'm interested in: TITLE_NO and EFFECT_DATE Table 2 also has two fields of interest: TITLE_NO and PAIDTO_DATE TITLE_NO is unique in Table 1, meaning each TITLE will have a unique EFFECT_DATE. Table 2 represents an accounting history of each TITLE, so for each TITLE_NO there may be one or more PAIDTO_DATE values. In both Tables the _DATE fields are stored as 9-character strings in the fomat YYYYMMDD. In all cases, the MM and DD values in Table 2 should be identical with those in Table 1. My intention is to produce a list that will contain the TITLE_NO of each TITLE where the MMDD value for EFFECT_DATE differ from any of the PAIDTO_DATE values for that TITLE_NO. The list must contain ONLY the PAIDTO_DATE values that differ, and the corresponding TITLE_NO. Sorry I can't explain this a little more technically, but if anyone can advise me, that would be fabulous. Thanks, Terry
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