Mysql function return select

Mysql function returning a value from a query. MySQL Function: Selecting and returning. When SELECTing into a variable, the result set must consist of exactly one row. I would like to write a mysql function that takes an integer as input and that function execute a select statements select id from table_name then i want that function return the result of select statements.

The RETURN statement terminates execution of a stored function and returns the value expr to the function caller. There must be at least one RETURN statement in a stored function. A stored function is a set of SQL statements that perform some operation and return a single value. Whenever the RETURN statement is reache the execution of the stored function is terminated immediately. Let’s take the example of creating a stored function.

We will use the customers table in the sample database for the demonstration. Ideal solution = Postgres DB link functions. It runs a query on a remote postgres DB and returns the in a dataset in the function.

Joinable to other tables on the local system. Indexes are utilized on the remote system. A solution I would have liked: Create my own db-link equivalent for MySQL.

Thus, the procedure succeeds or fails depending on whether the invoker has the EXECUTE privilege for it and the SELECT privilege for the mysql. If all values are constants, they are evaluated according to the type of expr and sorted. The search for the item then is done using a binary search. What is stored function in MySQL?

The function can return string, integer, char etc. To return table from MySQL, use stored procedure, not function. However, there is a not-so-pretty workaround: create a temporary table within the function body to store the values returne and then access this table outside the function. Otherwise, it returns the third expression.

Depending on the context in which it is use it returns either numeric or string value. SQL Create DB SQL Drop DB SQL Backup DB SQL Create Table SQL Drop Table SQL Alter Table SQL Constraints SQL Not Null SQL Unique SQL Primary Key SQL Foreign Key SQL Check SQL Default SQL Index SQL Auto Increment SQL Dates SQL Views SQL Injection SQL Hosting. The MAX() function comes in handy in many cases such as finding the greatest number, the most expensive product, and the largest payment from customers. ORDER BY with grouping functions so that use of this extension is no longer necessary. I have read about JSON objects and the JSON object type.

I do not necessarily want to store a JSON object. Serialization per se it not my question. The columns are regular Varchar, Int, etc. JSON Objects, normal database rows. To develop stored programs that return multiple values, you need to use stored procedures with INOUT or OUT parameters.

If you are not familiar with INOUT or OUT parameters, check it out the stored procedure’s parameters tutorial for the detailed information. CURRENT_USER() function uses the utfcharacter set. However, if the situation demands a Function to return a set of Data, you have only two choices.

You may create a string using some separators with your result set and return it to the caller. In this case, you need to use a string parser to retrieve Data Set as well. Hello, i want to write a function for fetching records from db and store the result set into a variable that function will return. But i am not able to access the result set outside function what i. In MySQL, you can return your query as a comma separated list by using the GROUP_CONCAT() function.

The GROUP_CONCAT() function was built specifically for the purpose of concatenating a query’s result set into a list separated by either a comma, or a delimiter of your choice. SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL An Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL Union SQL Group By SQL Having SQL Exists SQL Any, All SQL Select Into SQL Insert Into Select SQL Case SQL Null Functions SQL Stored Procedures SQL.