updating table rows in postgres using subquery
Postgres allows: This syntax is not standard SQL, but it is much more convenient for this type of query than standard SQL. I believe Oracle (at least) accepts something similar.
SQL
Join vs. sub-query
Taken from the MySQL manual (13.2.10.11 Rewriting Subqueries as Joins): A LEFT [OUTER] JOIN can be faster than an equivalent subquery because the server might be able to optimize it better—a fact that is not specific to MySQL Server alone. So subqueries can be slower than LEFT [OUTER] JOIN, but in my opinion their strength … Read more
Error converting data type varchar
OK. I finally created a view that works: Thanks to AdaTheDev and CodeByMoonlight. I used your two answers to get to this. (Thanks to the other repliers too of course) Now when I do joins with other bigint cols or do something like ‘SELECT * FROM MyView where mycol=1’ it returns the correct result with … Read more
How to write a foreach in SQL Server?
You seem to want to use a CURSOR. Though most of the times it’s best to use a set based solution, there are some times where a CURSOR is the best solution. Without knowing more about your real problem, we can’t help you more than that:
Backup a single table with its data from a database in sql server 2008
There are many ways you can take back of table. BCP (BULK COPY PROGRAM) Generate Table Script with data Make a copy of table using SELECT INTO, example here SAVE Table Data Directly in a Flat file Export Data using SSIS to any destination
How do I query for all dates greater than a certain date in SQL Server?
In your query, 2010-4-01 is treated as a mathematical expression, so in essence it read (2010 minus 4 minus 1 is 2005 Converting it to a proper datetime, and using single quotes will fix this issue.) Technically, the parser might allow you to get away with it will do the conversion for you, but in my opinion it is … Read more
How to copy a row and insert in same table with a autoincrement field in MySQL?
Use INSERT … SELECT: where c1, c2, … are all the columns except id. If you want to explicitly insert with an id of 2 then include that in your INSERT column list and your SELECT: You’ll have to take care of a possible duplicate id of 2 in the second case of course.
using sql count in a case statement
You can see the output for this request HERE
MySQL: Can’t create table (errno: 150)
From the MySQL – FOREIGN KEY Constraints Documentation: If you re-create a table that was dropped, it must have a definition that conforms to the foreign key constraints referencing it. It must have the correct column names and types, and it must have indexes on the referenced keys, as stated earlier. If these are not satisfied, MySQL … Read more
SQL Server: Make all UPPER case to Proper Case/Title Case
Here’s a UDF that will do the trick… You will still have to use it to update your data though.