Oct 23, 2012 · The SQL-Server docs says: column_alias can be used in an ORDER BY clause, but it cannot be used in a WHERE, GROUP BY, or HAVING clause. Similar in the MySQL doc it says: …

SQL Server: [S0001][8121] Column 'day' is invalid in the HAVING clause because it is not contained in either an aggregate function or the GROUP BY clause.

I wounder how I could use an alias in a where statement. Example : SELECT SUBSTRING(Column1, 1, 4) + SUBSTRING(Column1, 4, 3) AS Col1 FROM MyTable WHERE Col1 = 'MySearch' I use MSSQL …

Nov 1, 2016 · What are the pros and cons of using table aliases in SQL? I personally try to avoid them, as I think they make the code less readable (especially when reading through large where/and …

With an equal sign you know the alias name you are looking for is in the first position of the row. When 'AS' is used and the T_SQL spans multiple lines, the alias name could literally be anywhere. It is far, …

For mysql, sql_mode not including ONLY_FULL_GROUP_BY in the bitmask, the Optimizer has a chance to deliver better results with a varied / different use of the alias in the HAVING clause.

Aug 16, 2017 · UPDATE statisticsTable SET Value = (select count(*) FROM OtherTable o WHERE o.UserId = UserId ) <-- this is the part that concerns me WHERE id in (1,2,3) How does SQL Server …

Nov 12, 2010 · You can set table aliases in SQL typing the identifier right after the table name. SELECT * FROM table t1; You can even use the keyword AS to indicate the alias. SELECT * FROM table AS …

May 17, 2017 · I was wondering why can't I use alias in a count(*) and reference it in the having clause. For instance: select Store_id as StoreId, count(*) as _count from StoreProduct group by Store_id ...

Oct 29, 2013 · MySQL uses `backticks` to escape special characters. SQL Server can either use "double quotes" or [brackets] for identifiers (tables, columns, etc) and 'single quotes' for character …