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sql - How to do a Select in a Select - Stack Overflow I have a table containing a unique ID field Another field (REF) contains a reference to another dataset's ID field Now I have to select all datasets where REF points to a dataset that doesn't exi
python - How select. select() works? - Stack Overflow Python's select() gets passed through as a select() system call as you are expecting, but the problem you have with it blocking is a different issue, probably relating to buffering Just to satify yourself that select() is doing the right thing, try reading writing a file on the file system rather than using a special device such as a joystick You probably want to change your open() call
mysql - SELECT * WHERE NOT EXISTS - Stack Overflow SELECT * from employees WHERE NOT EXISTS (SELECT name FROM eotm_dyn) So basically I have one table with a list of employees and their details Then another table with some other details, including their name Where there name is not in the eotm_dyn table, meaning there is no entry for them, I would like to see exactly who they are, or in other words, see what exactly is missing The above
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sql - MySQL SELECT only not null values - Stack Overflow Is it possible to do a select statement that takes only NOT NULL values? Right now I am using this: SELECT * FROM table And then I have to filter out the null values with a php loop Is there a