common-table-expression

问题 I'm trying to formulate a SQLAlchemy query that uses a CTE to build a table-like structure of an input list of tuples, and JOIN it with one of my tables (backend DB is Postgres). Conceptually, it would look like: WITH to_compare AS ( SELECT * FROM ( VALUES (1, 'flimflam'), (2, 'fimblefamble'), (3, 'pigglywiggly'), (4, 'beepboop') -- repeat for a couple dozen or hundred rows ) AS t (field1, field2) ) SELECT b.field1, b.field2, b.field3 FROM my_model b JOIN to_compare c ON (c.field1 = b.field1)

来源： https://stackoverflow.com/questions/62017270/improve-performance-of-recursive-cte

来源： https://stackoverflow.com/questions/62017270/improve-performance-of-recursive-cte

来源： https://stackoverflow.com/questions/63848513/is-there-a-way-to-show-date-range-or-date-from-date-to-in-a-new-field-with-yyy

来源： https://stackoverflow.com/questions/63848513/is-there-a-way-to-show-date-range-or-date-from-date-to-in-a-new-field-with-yyy

来源： https://stackoverflow.com/questions/60761298/sql-using-with-to-declare-variable-on-insert-into

问题 In this question @GordonLinoff provided a solution (recursive common table expression) to my initial question. This is a follow-up question. Initial question : How can I loop through registrations until a certain amount (sum) of AmountPersons was reached and if the next AmountPersons was too high to be invited check the AmountPersons of the next row to see if it would fit? Please check the initial question via the link above to get the full picture. New situation : First we have 20 available

问题 I am using MySQL and I am wondering if it is possible to alter the order of the result generated by recursive CTE. My Table has these columns: |----------|----------|----------|----------| | ID | parentID | title | Sort | |----------|----------|----------|----------| | 1 | null | Maria | 1 | | 2 | 1 | John | 2 | | 3 | 2 | Maria | 3 | | 4 | 1 | Anthony | 1 | | 5 | 4 | XXX | 1 | | 6 | 4 | ... | 2 | | 7 | 2 | ... | 2 | | 8 | 2 | ... | 1 | | 9 | 1 | ... | 3 | I use the following query (We don't

问题 I am using MySQL and I am wondering if it is possible to alter the order of the result generated by recursive CTE. My Table has these columns: |----------|----------|----------|----------| | ID | parentID | title | Sort | |----------|----------|----------|----------| | 1 | null | Maria | 1 | | 2 | 1 | John | 2 | | 3 | 2 | Maria | 3 | | 4 | 1 | Anthony | 1 | | 5 | 4 | XXX | 1 | | 6 | 4 | ... | 2 | | 7 | 2 | ... | 2 | | 8 | 2 | ... | 1 | | 9 | 1 | ... | 3 | I use the following query (We don't

问题 I am using MySQL and I am wondering if it is possible to alter the order of the result generated by recursive CTE. My Table has these columns: |----------|----------|----------|----------| | ID | parentID | title | Sort | |----------|----------|----------|----------| | 1 | null | Maria | 1 | | 2 | 1 | John | 2 | | 3 | 2 | Maria | 3 | | 4 | 1 | Anthony | 1 | | 5 | 4 | XXX | 1 | | 6 | 4 | ... | 2 | | 7 | 2 | ... | 2 | | 8 | 2 | ... | 1 | | 9 | 1 | ... | 3 | I use the following query (We don't