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Sql query for gender

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Accidentally for all male Gender i have entered 'Female' and similarly for all Female gender i have entered 'Male'. For Exmaple. I the above line There should be Male instead of female. And there are all Male whose gender has been updated as Female. Same case for all Female Gender has been updated as Male.

SQL | CHECK Constraint

If you are looking for a generic way of doing it, you can also use below queries. I will not say this method is faster or simpler but it would be generic to all relational databases. So thought of sharing this. Learn more. Asked 10 years, 4 months ago. Active 9 months ago. Viewed 23k times. Sanju Sanju 5 5 gold badges 16 16 silver badges 31 31 bronze badges.

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Kenneth Chen Kenneth Chen 1. I believe you meant IIF. Sagar Maniar Sagar Maniar 1. Sudheer Kumar Sudheer Kumar 1 1 gold badge 7 7 silver badges 19 19 bronze badges. Verma Verma 1 5 5 bronze badges. Sign up or log in Sign up using Google.

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I want to count male, female and total students from Student table for a specific year specified. I wish if the result could be displayed in the form:. Any idea how I can make this happen?

You can transform this result into the form you want. If you want to do it within a query, then you can do it like this:.

Since you shouldn't mix grid formatting with data retrieval. I believe this is about as efficient as you can get with just a single pass through the student table. Simply change the year in the year CTE as needed. A fully normalized data model will likely have both a school year and gender table, so the CTEs would not be needed. Here is is a bare-bones sqlfiddle demonstration without student id and name as they are extraneous to the problem at hand.

Your request seems very simple, but it has two complications. The first is that one row is a summary of the other two. This suggests using rollup or grouping sets in the query.

The second is the requirement to have values even when you have no data. This suggests the use of a "driver" subquery. Such a subquery defines all the rows in the output before assigning values. You use a driver table with left outer join. The following approach to the query puts the final form together for the year. The then left joins the summary, pulling values from there if any:. This assumes that gender is represented as "Male" and "Female" and that there is a column called year in the data without sample input or table formats one has to guess on column names and sample values.

But it is probably the most efficient. This worked for me. But, still it couldn't display 0 for both M and F for years where there is no data :. Learn more. Count male, female and total Ask Question. Asked 7 years, 4 months ago.Constriant: check value between 0 and 2.

State a check constraint that check relation between two columns 3. Follow the contraint 4. Constraint check with 'upper' function 5. Constraint check with in function 6. Violate constraints 7. Check date type column for nullable and value range 8. Check nullable and value range for one single column data 9.

Add two conditions for one column Add constraint for date type column A check constraint can also be created or added as a table constraint. Add constraint to ensure that value from one column is bigger than that from another Setting the Check constraint for int value field during declaration Syntax for adding check constraint to a column Use decode function in check constraints Violate a check constraint Could only contain three values Must be upper case.

Constriant: check value between 0 and State a check constraint that check relation between two columns. Constraint check with 'upper' function. Constraint check with in function. Check date type column for nullable and value range. Check nullable and value range for one single column data.

Add two conditions for one column. Add constraint for date type column. Add constraint to ensure that value from one column is bigger than that from another. Setting the Check constraint for int value field during declaration.

Syntax for adding check constraint to a column. Use decode function in check constraints.SQL Constraints Check Constraint is used to specify a predicate that every tuple must satisfy in a given relation. It limits the values that a column can hold in a relation. Schema for student database in university:.

Explanation: In the above relation, the age of all students is greater than equal to 17 years, according to the constraint mentioned in the check statement in the schema of the relation. If, however following SQL statement is executed:. This article is contributed by Mayank Kumar.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. The predicate in check constraint can hold a sub query. Check constraint defined on an attribute restricts the range of values for that attribute.

If the value being added to an attribute of a tuple violates the check constraint, the check constraint evaluates to false and the corresponding update is aborted. Load Comments. We use cookies to ensure you have the best browsing experience on our website.You gave explanation very nicely. Easy to understand even for beginners keep going on. I would like to see more posts on tricky sqls.

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sql query for gender

Sql Server query to count male,female and total employees Get gender wise employee summary. Introduction : In this article example I am going to share the queries to get employee data gender wise i.

Description : It is very common requirement to get and show employee data gender wise.

sql query for gender

There are numerous ways to get this done but i have mentioned two queries to count the following:. Total Employee. It actually places all the 'Not Assigned' genders at last. Not Assigned. Now over to you:.

Count Male and Female using SQL

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Now I want to write a procedure which replaces these two values and output should be as below. I am creating a procedure, which gives me an error, I am using a cursor to fetch more than 1 rows.

I know that we can do it by using only 1 update statement but I want to try like this please look into this. There are a number of issues with what you have.

Well, not really finally, because as others have noted each of your update statements is updating all rows in the table, so you'll end up with everything as either male or female depending on which row it processes last.

You need to identify the specific row you want to update. One way is to query the rowid as part of the cursor, but there's a built-in way that is easier:.

sql query for gender

SQL Fiddle for that version. You can read more about for update and where current of in the documentation. Learn more. Replace a column values from 'male' to 'female' and 'female' to 'male' Ask Question. Asked 7 years, 2 months ago. Active 8 months ago. Viewed 46k times. Nick Krasnov INTO then you update all rows. I doubt thats intended Active Oldest Votes.

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MySQL conditional COUNT() and SUM() – Querychat

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Mikasa Posted on 10:12 pm - Oct 2, 2012

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