9/10/2023 0 Comments Postgresql for loop cursorSo, it may end up slowing down your MySQL server depending on how large the operation is. Note that each time a cursor fetches a row, it results in round network trips. Examples are integrity checks, index rebuilds. It would be best if you only used cursors when dealing with one row at a time. The output of this operation is: 1.080954670906067 Viewing the result in Arctype Caveats of MySQL cursorsĪ good look at the example shows that a SQL query like SELECT AVG(HTHG) FROM epl.football WHERE (FTR="H") will achieve the same result. We can call the procedure using its name, as shown below: SET = 0.0 ĬALL Executing the procedure we just created Executing the SQL procedure above will store the procedure in the database. We are defining the cursor inside a procedure because procedures are reusable. Procedures are written in MySQL and stored in the database. MySQL Procedure DELIMITER $$ CREATE PROCEDURE cursordemo(INOUT average_goals FLOAT)Ī procedure in MySQL is like a container that holds a sequence of instructions. Here's what the MySQL procedure should look like to accomplish this.
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