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What are the main performance differences between varchar and nvarchar SQL Server data types?
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size needed for tempdb
performance of triggers (for inserted and deleted tables that are stored in tempdb)
performance of row versioning (if using SNAPSHOT ISOLATION, since the version store is in tempdb)
ability to get new disk space when the CFO says that they just spent $1 million on a SAN last...
How to make Sequelize use singular table names
I have an model called User but Sequelize looks for the table USERS whenever I am trying to save in the DB. Does anyone know how to set Sequelize to use singular table names? Thanks.
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Generate GUID in MySQL for existing Data?
I've just imported a bunch of data to a MySQL table and I have a column "GUID" that I want to basically fill down all existing rows with new and unique random GUID's.
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Fastest way to determine if record exists
...e fastest way with the least overhead to determine if a record exists in a table or not.
11 Answers
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LAST_INSERT_ID() MySQL
...hat I think must be quite easy. I need to return the LAST INSERTED ID from table1 when I run the following MySql query:
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Rails migration for has_and_belongs_to_many join table
How do I do a script/generate migration to create a join table for a has_and_belongs_to_many relationship?
6 Answers
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How can I remove duplicate rows?
... is the best way to remove duplicate rows from a fairly large SQL Server table (i.e. 300,000+ rows)?
38 Answers
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Display / print all rows of a tibble (tbl_df)
...ated by the dplyr data frame manipulation package in R. It prevents long table outputs when accidentally calling the data frame.
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Database design for a survey [closed]
... would be the best way to implement this in the database, specifically the tables required. The survey contains different types of questions. For example: text fields for comments, multiple choice questions, and possibly questions that could contain more than one answer (i.e. check all that apply).
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Google Chrome Printing Page Breaks
...g to spec break-after and break-before apply only to block-level elements, table row groups, table rows (but see prose): drafts.csswg.org/css-break-3/#break-between – that means no floats or any fancy positioning tricks.
– Mikko Rantalainen
Jun 2 '16 at 11:27...