Is it possible to specify condition in Count()?
If you can’t just limit the query itself with a where clause, you can use the fact that the count aggregate only counts the non-null values: You can also use the sum aggregate in a similar way:
sql
‘NOT LIKE’ in an SQL query
You have missed out the field name id in the second NOT LIKE. Try: The AND in the where clause joins 2 full condition expressions such as id NOT LIKE ‘1%’ and can’t be used to list multiple values that the id is ‘not like’.
what is the difference between triggers, assertions and checks (in database)
Triggers – a trigger is a piece of SQL to execute either before or after an update, insert, or delete in a database. An example of a trigger in plain English might be something like: before updating a customer record, save a copy of the current record. Which would look something like: The difference between … Read more
‘CREATE PROCEDURE’ must be the only statement in the batch (Erro)
The error is self-explanatory – you cannot issue a CREATE PROCEDURE statement unless it’s the only statement in the batch. In SSMS the GO keyword splits the statement into separate batches, so you need to add one after the statement before the CREATE PROCEDURE:
Can I use multiple “with”?
Try: And yes, you can reference common table expression inside common table expression definition. Even recursively. Which leads to some very neat tricks.
SQL: IF clause within WHERE clause
Use a CASE statementUPDATE: The previous syntax (as pointed out by a few people) doesn’t work. You can use CASE as follows: Or you can use an IF statement like @N. J. Reed points out.
Get current year in TSQL
Yes, it’s remarkably easy in fact:
How can I search (case-insensitive) in a column using LIKE wildcard?
I looked around some and didn’t find what I was after so here goes. This works fine, but not if the tree is named Elm or ELM etc… How do I make SQL case insensitive for this wild-card search? I’m using MySQL 5 and Apache.
The used SELECT statements have a different number of columns
Put the columns names explicitly rather than *, and make sure the number of columns and data types match for the same column in each select. Update: I really don’t think you want to be UNIONing those tables, based on the tables names. They don’t seem to contain related data. If you post your schema … Read more
mysql update column with value from another table
In addition to this answer if you need to change tableB.value according to tableA.value dynamically you can do for example: