inner-join

问题 i am not an expert in sql programming and i was wondering if you can help me reformulate the following query using INNER JOIN? db_query(" select max(field_date_and_time_value2) as last_time from field_data_field_date_and_time where (field_date_and_time_value2 > '".$today."') AND (".$node->uid." = (select uid from node where nid = " . $node->nid ."))"); 回答1: Would something like this work? SELECT max(a.field_date_and_time_value2) as last_time , b.uid FROM field_data_field_date_and_time a INNER

问题 What I'm working on is an email clean up script for our database. In so doing we identified a list of domains that are invalid, broken or no longer around. We do this by identifying the domain name i.e. everything after the @ sign. update url_links set link_bad=1, emailCarrier='bad-domain.com' where contact_email like '%@bad-domain.com'; identifies the provider and sets the field. The problem is we have hundreds of domains that are not valid (the above is just an example) What I'd like to do

问题 What I'm working on is an email clean up script for our database. In so doing we identified a list of domains that are invalid, broken or no longer around. We do this by identifying the domain name i.e. everything after the @ sign. update url_links set link_bad=1, emailCarrier='bad-domain.com' where contact_email like '%@bad-domain.com'; identifies the provider and sets the field. The problem is we have hundreds of domains that are not valid (the above is just an example) What I'd like to do

问题 I'm using select inner join as below. How do I get my expected result? Here is the sql syntax: select tgr.id, tgr.venid, sum(tgrd.qty*tgrd.pri), sum(tgrp.amo) from tgr inner join tgrd on tgr.id = tgrd.id inner join tgrp on tgr.id = tgrp.id where tgr.id = 3 group by tgr.id, tgr.venid having sum(tgrd.qty*tgrd.pri)-sum(tgrp.amo)>0; result: 3 | 1 | 462000 | 262000 but I'm expecting result: 3 | 1 | 231000 | 131000 source from 3 tables: tgr, tgrd, tgrp tgr table id venid 3 1 tgrd table id plu qty

问题 I have a page that displays a list of projects. With each project is displayed the following data retrieved from a mysqli database: Title Subtitle Description Part number (1 of x) The total number of photos associated with that project A randomly selected photo from the project A list of tags Projects are displayed 6 per page using a pagination system As this is based on an old project of mine, it was originally done with sloppy code (I was just learning and did not know any better) using

问题 How can I use the LIKE clause with an inner join using sqldf in R? The code: Name <- c("Jack","Jill","Romeo") Name <- as.data.frame(Name) FullName <- c("School Jack H", "School Juliet G", "College Jill M", "College Romeo F") Marks <- c("100","82","54","0") FullBio <- cbind(FullName, Marks) FullBio <-as.data.frame(FullBio) And then when I run: sqldf("select a.*, b.* from Name a join FullBio b on a.Name like '%'+b.[FullName]+'%'") returns 0 rows. Why? What are my other alternatives please. I

问题 How can I use the LIKE clause with an inner join using sqldf in R? The code: Name <- c("Jack","Jill","Romeo") Name <- as.data.frame(Name) FullName <- c("School Jack H", "School Juliet G", "College Jill M", "College Romeo F") Marks <- c("100","82","54","0") FullBio <- cbind(FullName, Marks) FullBio <-as.data.frame(FullBio) And then when I run: sqldf("select a.*, b.* from Name a join FullBio b on a.Name like '%'+b.[FullName]+'%'") returns 0 rows. Why? What are my other alternatives please. I

问题 Trying to join 2 dataframes according to multiple conditions and time interval condition like in the following example: # two sample dataframes with time intervals df1 <- data.frame(key1 = c("a", "b", "c", "d", "e"), key2 = c(1:5), time1 = as.POSIXct(hms::as.hms(c("00:00:15", "00:15:15", "00:30:15", "00:40:15", "01:10:15"))), time2 = as.POSIXct(hms::as.hms(c("00:05:15", "00:20:15", "00:35:15", "00:45:15", "01:15:15")))) %>% mutate(t1 = interval(time1, time2)) %>% select(key1, key2, t1) df2 <-

问题 I want to show in an Html the name of the city, state, and country of a publication. But they are in different tables. Here is my models.py class country(models.Model): country_name = models.CharField(max_length=200, null=True) country_subdomain = models.CharField(max_length=3, null=True) def __str__(self): return self.country_name class countrystate(models.Model): state_name = models.CharField(max_length=200, null=True) country = models.ForeignKey(country, on_delete=models.CASCADE, null=True

问题 I want to show in an Html the name of the city, state, and country of a publication. But they are in different tables. Here is my models.py class country(models.Model): country_name = models.CharField(max_length=200, null=True) country_subdomain = models.CharField(max_length=3, null=True) def __str__(self): return self.country_name class countrystate(models.Model): state_name = models.CharField(max_length=200, null=True) country = models.ForeignKey(country, on_delete=models.CASCADE, null=True