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How to force LINQ Sum() to return 0 while source collection is empty
... handled method by the EF Queryable Provider and will generate the related SQL statement.
– Simon Belanger
Aug 11 '15 at 1:52
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MySQL query to get column names?
I'd like to get all of a mysql table's col names into an array in php?
21 Answers
21
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sql ORDER BY multiple values in specific order?
Ok I have a table with a indexed key and a non indexed field.
I need to find all records with a certain value and return the row.
I would like to know if I can order by multiple values.
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...的情况下，天涯社区正谋求转型。该公司的主要转型方向包括社交媒体、社区游戏化、社区型电子商务，以及社交型互联网金融业务。
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Java: Get month Integer from Date
... if you use date.toInstant() and you happen to be working with a java.sql.Date (the child of java.util.Date) then you will get an UnsupportedOperationException. Try new java.sql.Date(src.getTime()).toLocalDate()
– Adam
Feb 24 '17 at 14:15
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How can I export the schema of a database in PostgreSQL?
...broke down but fortunately I backed up
the folder C:\Program Files\PostgreSQL.
8 Answers
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Case in Select Statement
I have an SQL statement that has a CASE from SELECT and I just can't get it right. Can you guys show me an example of CASE where the cases are the conditions and the results are from the cases. For example:
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Rails find record with zero has_many records associated [duplicate]
... @sixty4bit - It works because when you do includes it does a join. In a SQL join, you get all the fields of both tables (in this case cities and photos) for each row unless you change the projection of the query. So, he's using that to his advantage to check whether a required database identifier...
Entity Framework: There is already an open DataReader associated with this Command
...lso try to cast the query to ObjectQuery and call ToTraceString to see the SQL command. It is hard to track. I always turn on MARS.
– Ladislav Mrnka
Feb 1 '11 at 22:27
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MySQL “incorrect string value” error when save unicode string in Django
...em for me. The root cause being:
You cannot store 4-byte characters in MySQL with the utf-8 character set.
MySQL has a 3 byte limit on utf-8 characters (yes, it's wack, nicely summed up by a Django developer here)
To solve this you need to:
Change your MySQL database, table and columns to use...