with-statement

问题 I am trying to use a WITH clause in Oracle, but it is not returning any data. This is the query I am trying to run... with test as (select count(*) from my_table) select * from test; When I run this code, I get back the count of the records in my_table select count(*) from my_table I am on Oracle 10g so the query should work... select * from v$version; yields Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi PL/SQL Release 10.2.0.4.0 - Production CORE 10.2.0.4.0 Production TNS

问题 How do I create this SQL using ZF2? WITH q AS ( SELECT m.*, CAST(ROW_NUMBER() OVER (ORDER BY m.PersonId) AS VARCHAR(MAX)) COLLATE Latin1_General_BIN AS bc FROM mytable m WHERE ParentID IS NULL UNION ALL SELECT m.*, q.bc + '.' + CAST(ROW_NUMBER() OVER (PARTITION BY m.ParentID ORDER BY m.PersonID) AS VARCHAR(MAX)) COLLATE Latin1_General_BIN FROM mytable m JOIN q ON m.parentID = q.PersonID ) SELECT * FROM q ORDER BY bc From: https://stackoverflow.com/a/1757302/351785 Starting in a model, I can

问题 How do I create this SQL using ZF2? WITH q AS ( SELECT m.*, CAST(ROW_NUMBER() OVER (ORDER BY m.PersonId) AS VARCHAR(MAX)) COLLATE Latin1_General_BIN AS bc FROM mytable m WHERE ParentID IS NULL UNION ALL SELECT m.*, q.bc + '.' + CAST(ROW_NUMBER() OVER (PARTITION BY m.ParentID ORDER BY m.PersonID) AS VARCHAR(MAX)) COLLATE Latin1_General_BIN FROM mytable m JOIN q ON m.parentID = q.PersonID ) SELECT * FROM q ORDER BY bc From: https://stackoverflow.com/a/1757302/351785 Starting in a model, I can

问题 This question already has answers here : How can I open multiple files (number of files unknown beforehand) using “with open” statement? (3 answers) Closed 3 years ago . Is it possible to with open() all files contained in a list and create file handles for writing? For example, if my function accepts a list of filenames for data-splitting in a machine learning task, fname_list = ['train_dataset.txt', 'validate_dataset.txt', 'test_dataset.txt'] then it would be convenient to be able to do:

问题 I have a sequence of X() actions during which certain buttons might be grabbed (and not released afterwards). In order to prevent buttons from ending up grabbed, I therefore have to ungrab every button at the end, for example: action1 >> action2 >> action3 >> ungrabAllButtons I wish to encode this requirement as a type, so that action1 , action2 , action3 can only be used if the buttons are ungrabbed afterwards. That is, even though action1 , action2 , are really X() actions, I would like

问题 Working with R, this is a real WTF: R> f_string <- 'Sepal.Length ~ Sepal.Width' R> l <- with(iris, lm(as.formula(f_string))) # works fine R> f_formula <- as.formula(f_string) R> l <- with(iris, lm(f_formula)) Error in eval(expr, envir, enclos) : object 'Sepal.Length' not found Why does as.formula have to be inside the lm() call? I get it that this is a question about which environment things are evaluated in, because this works: R> f_formula <- with(iris, as.formula(f_string)) R> lm(f_formula

问题 Working with R, this is a real WTF: R> f_string <- 'Sepal.Length ~ Sepal.Width' R> l <- with(iris, lm(as.formula(f_string))) # works fine R> f_formula <- as.formula(f_string) R> l <- with(iris, lm(f_formula)) Error in eval(expr, envir, enclos) : object 'Sepal.Length' not found Why does as.formula have to be inside the lm() call? I get it that this is a question about which environment things are evaluated in, because this works: R> f_formula <- with(iris, as.formula(f_string)) R> lm(f_formula

问题 After reading the with statement section of the language documentation of Python, I was wondering if it is correct to state that this Python code: with EXPRESSION as TARGET: SUITE is equivalent to this one: try: manager = (EXPRESSION) value = manager.__enter__() TARGET = value # only if `as TARGET` is present in the with statement SUITE except: import sys if not manager.__exit__(*sys.exc_info()): raise else: manager.__exit__(None, None, None) Edit The correct equivalent Python code (the real

问题 After reading the with statement section of the language documentation of Python, I was wondering if it is correct to state that this Python code: with EXPRESSION as TARGET: SUITE is equivalent to this one: try: manager = (EXPRESSION) value = manager.__enter__() TARGET = value # only if `as TARGET` is present in the with statement SUITE except: import sys if not manager.__exit__(*sys.exc_info()): raise else: manager.__exit__(None, None, None) Edit The correct equivalent Python code (the real

问题 I have 2 tables. Table A has Date, ISBN (for Book), Demand(demand for that date). Table B has Date, ISBN (for Book), and SalesRank. The sample data is as follows: The DailyBookFile has 150k records for each date, from year 2010 (i.e. 150k * 365 days * 8 years) rows. Same goes with SalesRank Table having about 500k records for each date DailyBookFile Date Isbn13 CurrentModifiedDemandTotal 20180122 9780955153075 13 20180122 9780805863567 9 20180122 9781138779396 1 20180122 9780029001516 9