column-alias

I understand that AS is used to create an alias. Therefore, it makes sense to have one long name aliased as a shorter one. However, I am seeing a SQL query NULL as ColumnName What does this imply? SELECT *, NULL as aColumn Aliasing can be used in a number of ways, not just to shorten a long column name. In this case, your example means you're returning a column that always contains NULL , and it's alias/column name is aColumn . Aliasing can also be used when you're using computed values, such as Column1 + Column2 AS Column3 . It means that "aColumn" has only Null values. This column could be

I am executing the below query and using alias name for all columns. I have named alias with a . since that is a requirement. now, I want to refer to the alias name directly in the where clause and i do is as given below: SELECT pt.prod_desc AS"PROD_DESC", ( CASE WHEN pt.prod_level='2' THEN 'Product' WHEN pt.prod_level='4' THEN 'Sub-Product' WHEN pt.prod_level='5' THEN 'Service' ELSE 'N/A' END) AS"PROD_LEVEL", prod_id AS "PROD_ID", isactive AS "IsActive", updt_usr_sid AS "UPDT_USR_SID", updt_ts AS "UPDT_TS", ( CASE WHEN pt.prod_level='5' THEN parent_prod_id ELSE NULL END) AS ".SUB_PROD_ID", (

What i am trying to achieve is in my database i have a table named channel i am using laravel's eloquent class to access these the properties from the table The problem that i am facing is that the table name is column and the column name is channel so when accessing that property looks like this. User::find(1)->channel->channel How can i modify this to say User::find(1)->channel->name We cannot change the table name in the database. Options i have thought of: 1)Create views for tables that need columns changed. Too messy... 2)Use column alias.... laravel documentation...sigh.. no clue how? 3

I am only a beginner in SQL, but I've come across this annoying error. SQL is having an issue with the WHERE clause of this script: SELECT ITEM_ID, ITEM_PRICE, DISCOUNT_AMOUNT, QUANTITY, (ITEM_PRICE*QUANTITY) AS price_total, (DISCOUNT_AMOUNT*QUANTITY) AS discount_total, ((ITEM_PRICE-DISCOUNT_AMOUNT)*QUANTITY) AS item_total FROM ORDER_ITEMS WHERE item_total > 500 ORDER BY item_total; I am receiving this error: Error starting at line : 1 in command - SELECT ITEM_ID, ITEM_PRICE, DISCOUNT_AMOUNT, QUANTITY, (ITEM_PRICE*QUANTITY) AS price_total, (DISCOUNT_AMOUNT*QUANTITY) AS discount_total, ((ITEM

Can I modify the next to use the column aliases avg_time and cnt in an expression ROUND(avg_time * cnt, 2) ? SELECT COALESCE(ROUND(stddev_samp(time), 2), 0) as stddev_time, MAX(time) as max_time, ROUND(AVG(time), 2) as avg_time, MIN(time) as min_time, COUNT(path) as cnt, ROUND(avg_time * cnt, 2) as slowdown, path FROM loadtime GROUP BY path ORDER BY avg_time DESC LIMIT 10; It raises the next error: ERROR: column "avg_time" does not exist LINE 7: ROUND(avg_time * cnt, 2) as slowdown, path The next, however, works fine (use primary expressions instead of column aliases: SELECT COALESCE(ROUND