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16 Cards in this Set
- Front
- Back
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Default order for order by clause |
asc. |
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order by column number |
select username,email from Users order by 1 desc will order the results by username desc |
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select expressions + order by |
select name, price*quantity 'total price' from sales order by 'total price' desc select name, price*quantity 'total price' from sales order by [total price] desc select name, price*quantity 'total price' from sales order by price*quantity desc select name, price*quantity 'total price' from sales order by 2 desc |
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group by - aggregate functions |
sum,avg,count,max,min,round |
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User defined aggregate functions |
- |
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group by - non-aggregate columns in select limitation |
All non- aggregate columns in select must be included in the group by clause |
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having clause |
The HAVING clause is used to filter the result set based on the result of an aggregate function. It is typically located near or at the end of the SQL statement. HAVING is often coupled with the presence of the GROUP BY clause, although it is possible to have a HAVING clause without the GROUP BY clause. SELECT Store_Name, SUM(Sales)FROM Store_InformationGROUP BY Store_NameHAVING SUM(Sales) > 1500; |
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sql alias |
Alias refers to the practice of using a different temporary name to a database table or a column in a table. SELECT "table_alias"."column_name1" "column_alias"FROM "table_name" "table_alias"; |
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sql alias using 'as' |
The keyword AS is used to assign an alias to the column or a table. It is inserted between the column name and the column alias or between the table name and the table alias. SELECT "table_alias"."column_name1" AS "column_alias"FROM "table_name" AS "table_alias"; |
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function to find the number os character in nvarchar |
len |
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how to find last three characters in nvarchar |
right(string,3) |
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how to round a float |
round(float) |
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salary 1 2 1 What is avg(salary)? |
1 |
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Salary 1 2 1 How to get the accurate avg ? |
avg(cast(salary as float)) |
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What is the right way to print space separated integers |
select cast(int1 as nvarchar(100))+' '+cast(int2 as nvarchar(100)) |
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how to round a float to nearest integer |
round(float,0) |
