Count number of tables in database mysql

MySQL has no limit on the number of databases. The underlying file system may have a limit on the number of directories. MySQL has no limit on the number of tables. The underlying file system may have a limit on the number of files that represent tables. Individual storage engines may impose engine-specific constraints. InnoDB permits up to 4 billion tables. Optimizing SQL Statements. Index Merge Optimization. Engine Condition Pushdown Optimization. Index Condition Pushdown Optimization.

Nested Join Optimization. Outer Join Optimization.

Find number of tables in MySQL database

Outer Join Simplification. Multi-Range Read Optimization. Constant-Folding Optimization. Function Call Optimization. Window Function Optimization.

Row Constructor Expression Optimization. Avoiding Full Table Scans. Optimizing Subqueries with Materialization. Optimizing Performance Schema Queries. Optimizing Data Change Statements. Optimizing Database Privileges. Other Optimization Tips. Primary Key Optimization.

Using the COUNT, AVG, and SUM function in a MySQL query#10

Foreign Key Optimization. Multiple-Column Indexes. Comparison of B-Tree and Hash Indexes. Optimizer Use of Generated Column Indexes.

Optimizing Database Structure.

count number of tables in database mysql

Optimizing for Character and String Types. Optimizing for Many Tables. Limits on Number of Databases and Tables.MySQL has no limit on the number of databases.

What is the SQL query to show the number of tables in a database?

The underlying file system may have a limit on the number of directories. MySQL has no limit on the number of tables. The underlying file system may have a limit on the number of files that represent tables. Individual storage engines may impose engine-specific constraints.

InnoDB permits up to 4 billion tables. Optimizing SQL Statements. Index Merge Optimization. Engine Condition Pushdown Optimization. Index Condition Pushdown Optimization. Nested Join Optimization. Outer Join Optimization. Outer Join Simplification. Multi-Range Read Optimization. Function Call Optimization.

Get record count for all tables in MySQL database?

Row Constructor Expression Optimization. Avoiding Full Table Scans. Optimizing Subqueries with Materialization. Optimizing Data Change Statements. Optimizing Database Privileges. Other Optimization Tips. Primary Key Optimization. Foreign Key Optimization. Multiple-Column Indexes.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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count number of tables in database mysql

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count number of tables in database mysql

You can probably put something together with Tables table. I used to use the selected answer above, but this is much easier. This stored procedure lists tables, counts records, and produces a total number of records at the end.

You could then easily use PHP or whatever to return the max of the 2 data columns to give the "best estimate" for row count. Much better than the estimated rows. This may be an issue if you have no tables with auto increment, though.

count number of tables in database mysql

The entire result of the query shown here - all rows taken together - comprise a valid SQL statement ending in a semicolon - no dangling 'union'. The dangling union is avoided by use of a union in the query below. Create and assign the list of tables to the array variable in this bash script separated by a single space just like in the code below.

Also it ignores views. Poster wanted row counts without counting, but didn't specify which table engine. With InnoDB, I only know one way, which is to count. I am making no assertions about this other than that this is a really ugly but effective way to get how many rows exist in each table in the database regardless of table engine and without having to have permission to install stored procedures, and without needing to install ruby or php.

Yes, its rusty.

What is the SQL query to show the number of tables in a database?

Yes it counts. Based on Nathan's answer above, but without needing to "remove the final union" and with the option to sort the output, I use the following SQL.Suprotim has received the prestigous Microsoft MVP award for nine times in a row now. In a professional capacity, he is the CEO of A2Z Knowledge Visuals Pvt Ltd, a digital group that represents premium web sites and digital publications comprising of Professional web, windows, mobile and cloud developers, technical managers, and architects.

Get in touch with him on Twitter suprotimagarwalLinkedIn or befriend him on Facebook. Thanks for the query.

Its not working for sample databases such as AdventureWorks db. Prawin: It works. Gracias por el query, funciona bien : pero deberias especificar que solo cambien el nombre de la BD y nada mas el resto no se toca. I hav multiple schema in DB.

How can i identify that result given is for that particular schema n not cumulative? Count the number of tables excluding system tables.

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Post a Comment. Count number of tables in a SQL Server database. I got a request from a user and he wanted to count the number of tables in a database. It's quiet simple. About The Author. Newer Post Older Post Home. Subscribe to: Post Comments Atom.By submitting this form, I agree to Sisense's privacy policy and terms of service. Keeping track of your row counts can be helpful for budgeting and capacity planning, yet accurate counts are surprisingly Sisense Data Team March 15, Keeping track of your row counts can be helpful for budgeting and capacity planning, yet accurate counts are surprisingly hard to get.

Databases keep row counts in their stats tables for planning query execution, but the results are only approximate and can be badly out of date. You can get exact counts by running a count query for every table, but this can be tedious and require external scripting.

Instead, you can get exact row counts with a single query. This query is not going to be fast: It will take as long as running select count 1 from foo on every table in your database.

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We can get this easily with:. Fortunately, postgres has the wondrous eval which executes strings of SQL. This is needed to turn a list of table names into a string of many counts connected by unions.

Finally, we can execute a string as a prepared statement. This is the simplest way to run a string as a query in MySQL. We can expand that query to concatenate the select statements, and save the results with into sql. Once saved, we can run it as a prepared statement. The user defined function is more readable, extensible, and reuseable. You now have a couple of ways to get exact row counts in the most common databases, and a few new SQL techniques to play with.

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I am growing the number of tables I have and I am sometimes curious just to do a quick command line query to count the number of tables in my database. Is that possible? If so, what is the query? Learn more. Asked 9 years, 1 month ago. Active 2 years, 4 months ago. Viewed k times.

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Genadinik Genadinik Active Oldest Votes. Ajay 4, 4 4 gold badges 27 27 silver badges 45 45 bronze badges. Joseadrian Joseadrian 3, 2 2 gold badges 13 13 silver badges 7 7 bronze badges. I only got it working when I used only the subquery.

Gaia Sorry, I forgot that Database was a reserved word. So, I surrounded the word with Double Quotes. Scott Elblein Nov 20 '13 at SE post : dba.Generate your own badge code here. Toggle navigation. Cancel Not a member? Sign Up Forgot Password? Let us first count the total number of records in the table with this count command. Now we can add some condition to this SQL to count the records with different conditions.

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Let us find out the number of students in class Four in out table. This article is written by plus2net. Number of Comments : I need to see them on single web page together. Rajan Arora Really simple and nice way to explain Gr8 gng Keep it Up Bruno Pls I need a syntax for count with this scenario: patients who visited their gp in the last three months. Siddharth how to add a new row of total at the last of all the integer record.

Alvin Hi there, is it possible to do this? Swetha How to find highest value in the table where no total column we need to find highest without having total column. Contact us. Pls I need a syntax for count with this scenario: patients who visited their gp in the last three months.

Pls i need a syntax to increase the count by 1. Hi there, is it possible to do this? By using if condition you can create grid view, this part is added to the main contain of this page. How to find highest value in the table where no total column we need to find highest without having total column. Post your commentssuggestionerrorrequirements etc here.