There are multiple ways to find tables and analyze them for optimization. Start by connecting to your MySQL database: USE [database_name];Copy Depending on your use case, try the queries below to see how to find optimization candidates. Tip 1: Show Unused Space in Table Check the status ...
i want to find out foreign key columns along with their table name by giving the input as table name and primary key column name. Suppose, student(T) is having a primary key as student_id, and now this key is shared among different tables as a foreign key such as ...
To check aMyISAMtable, use the following commands: myisamchktbl_name This finds 99.99% of all errors. What it cannot find is corruption that involvesonlythe data file (which is very unusual). If you want to check a table, you should normally runmyisamchkwithout options or with the-s(...
1 or true to include the field in the return documents. NOTE For better understanding I have written similar MySQL query. Selecting specific fields MongoDB :db.collection_name.find({},{name:true,email:true,phone:true}); MySQL :SELECT name,email,phone FROM table_name; ...
1 select * transform row value as table column name 1 Row into Column in mysql without pivot and group concat 0 How transform rows to column in mysql 0 How to display the whole column value with GROUP_CONCAT in MySQL 0 Pivot a table using `group_concat` and `gro...
Indexes are used to find rows with specific column values quickly. Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. The larger the table, the more this costs. If the table has an index for the columns in question, ...
SELECT * FROM tablename If you just want to select records which have value=1 in the field1-name row, use the following query: SELECT * FROM tablename WHERE field1-name='1' In the same way, you could select records based on any field in the database. You can also search in more...
5. MySQL Workbench MySQL Workbench offers a graphical interface for interacting with databases. We can find the engine used for a table by opening the table inspector (Schemas > University > Tables > right-click Student > Table Inspector): The engine is specified in the table details along wit...
Replace[database_name]with the real database name. The command's output confirms the database change. Step 3: Create a Table After creating or selecting a database, proceed to create a MySQL table. For example, to create a table named "employee" with two columns: "id" and "name", ru...
set @sql = concat( 'select ', @mycolumnname, ' from ', @mytablestring ); prepare stmt from @sql; execute stmt; drop prepare stmt; If anyone knows how to turn this snippet into some find and replace code for a whole table (using looping, I suppose), please post it here. Thanks....