sql server - T-SQL - Aliasing using "=" versus "as" - Stack Overflow
Using a equal sign instead of 'AS' is by far easier to read. 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, far, far easier to find the 'Items' alias when equals is used than when 'AS ...
SQL Server: how to use alias in update statement?
Aug 16, 2017 · An alias for the table you are updating is not allowed but you can use the table name in the normal way: UPDATE statisticsTable. SET Value = (select count(*) FROM OtherTable o. WHERE o.UserId = statisticsTable.UserId ) WHERE id in (1,2,3) answered Nov 21, 2022 at 17:45. Stephen Westlake.
What's the purpose of SQL keyword "AS"? - Stack Overflow
Nov 12, 2010 · 13. The AS keyword is to give an ALIAS name to your database table or to table column. In your example, both statement are correct but there are circumstance where AS clause is needed (though the AS operator itself is optional), e.g. SELECT salary * 2 AS "Double salary" FROM employee;
SQL alias for SELECT statement - Stack Overflow
Jul 13, 2012 · SQL Use alias in Where statement. 28. Creating alias in query and using it. 1. help with alias sql. 8. If ...
SQL: Alias Column Name for Use in CASE Statement
Oct 18, 2009 · 0. If you write only equal condition just: Select Case columns1 When 0 then 'Value1' when 1 then 'Value2' else 'Unknown' End. If you want to write greater , Less then or equal you must do like this: Select Case When [ColumnsName] >0 then 'value1' When [ColumnsName]=0 Or [ColumnsName]<0 then 'value2' Else 'Unkownvalue' End.
database - When to use SQL Table Alias - Stack Overflow
There are two reasons for using table aliases. The first is cosmetic. The statements are easier to write, and perhaps also easier to read when table aliases are used. The second is more substantive. If a table appears more than once in the FROM clause, you need table aliases in order to keep them distinct.
SQL Use alias in Where statement - Stack Overflow
Apr 3, 2009 · With PostgreSQL 9.3+ OR Oracle 12c, there is now lateral join that allows creating an alias. Lateral joins are joints inside witch you can reference preceding tables. SELECT col1, col2,col3 FROM MyTable m JOIN LATERAL ( SELECT SUBSTRING(m.Column1, 1, 4) + SUBSTRING(Column1, 4, 3) AS Col1 ) x ON true WHERE Col1 = 'MySearch'
How do I perform a GROUP BY on an aliased column in SQL Server?
SELECT LastName + ', ' + FirstName AS 'FullName'. FROM customers. GROUP BY LastName + ', ' + FirstName. Alternately you could put the select into a subselect or common table expression, after which you could group on the column name (no longer an …
How can I assign variable name to SQL query alias column name?
Oct 12, 2015 · declare @Sql varchar(max) set @sql = 'select top 10 id, field1 - field2 as '. +''''+@test+'''' + ' from table1. where date_entered >' +cast(@startdate as varchar(10))+. ' and date_entered <= ' + cast(@enddate as varchar(10)) EXECUTE sp_executesql @SQL. Actually you should probably set parameter values for the execute sp_executesql statement but ...
sql - Filter based on an aliased column name - Stack Overflow
1. put the case in the where. SQL Server will be smart enough to just evaluate it one time so you aren't really duplicating the code: SELECT id, CASE WHEN <snip extensive column definition> END AS myAlias FROM myTable WHERE CASE WHEN <snip extensive column definition> END IS …