Alternative to except in MySQL
You could use NOT IN
Database
I want to use CASE statement to update some records in sql server 2005
Add a WHERE clause
Temporary table in SQL server causing ‘ There is already an object named’ error
You are dropping it, then creating it, then trying to create it again by using SELECT INTO. Change to: In MS SQL Server you can create a table without a CREATE TABLE statement by using SELECT INTO
#1062 – Duplicate entry for key ‘PRIMARY’
You need to remove shares as your PRIMARY KEY OR UNIQUE_KEY
MySQL Select Multiple VALUES
Try or: Or the equivalent in:
Conditional JOIN Statement SQL Server
I think what you are asking for will work by joining the Initial table to both Option_A and Option_B using LEFT JOIN, which will produce something like this: Example code: Once you have done this, you ‘ignore’ the set of NULLS. The additional trick here is in the SELECT line, where you need to decide … Read more
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.
How to change collation of database, table, column?
You need to either convert each table individually: (this will convert the columns just as well), or export the database with latin1 and import it back with utf8mb4.
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
How to check if mysql database exists
If you just need to know if a db exists so you won’t get an error when you try to create it, simply use (From here):