I have 2-3 different column names that I want to look up in the entire database and list out all tables which have those columns. Is there any easy script?
To get all tables with columns columnA
or ColumnB
in the database YourDatabase
:
SELECT DISTINCT TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME IN ('columnA','ColumnB')
AND TABLE_SCHEMA='YourDatabase';
SELECT TABLE_NAME, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE COLUMN_NAME LIKE '%wild%';
TABLE_SCHEMA
to the fields of the return set to see all databases + tables that contain that column name.
show tables;
. Can anyone explain why this might be the case?
More simply done in one line of SQL:
SELECT * FROM information_schema.columns WHERE column_name = 'column_name';
SELECT DISTINCT TABLE_NAME, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE column_name LIKE 'employee%'
AND TABLE_SCHEMA='YourDatabase'
In older MySQL versions or some MySQL NDB Cluster versions that do not have information_schema
, you can dump the table structure and search the column manually.
mysqldump -h$host -u$user -p$pass --compact --no-data --all-databases > some_file.sql
Now search the column name in some_file.sql
using your preferred text editor, or use some nifty AWK scripts.
And a simple sed script to find the column. Just replace COLUMN_NAME with yours:
sed -n '/^USE/{h};/^CREATE/{H;x;s/\nCREATE.*\n/\n/;x};/COLUMN_NAME/{x;p};' <some_file.sql
USE `DATABASE_NAME`;
CREATE TABLE `TABLE_NAME` (
`COLUMN_NAME` varchar(10) NOT NULL,
You can pipe the dump directly in sed, but that's trivial.
For those searching for the inverse of this, i.e. looking for tables that do not contain a certain column name, here is the query...
SELECT DISTINCT TABLE_NAME FROM information_schema.columns WHERE
TABLE_SCHEMA = 'your_db_name' AND TABLE_NAME NOT IN (SELECT DISTINCT
TABLE_NAME FROM information_schema.columns WHERE column_name =
'column_name' AND TABLE_SCHEMA = 'your_db_name');
This came in really handy when we began to slowly implement use of InnoDB's special ai_col
column and needed to figure out which of our 200 tables had yet to be upgraded.
If you want to "get all tables only", then use this query:
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME like '%'
and TABLE_SCHEMA = 'tresbu_lk'
If you want "to get all tables with columns", then use this query:
SELECT DISTINCT TABLE_NAME, COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE column_name LIKE '%'
AND TABLE_SCHEMA='tresbu_lk'
Use this one line query. Replace desired_column_name by your column name.
SELECT TABLE_NAME FROM information_schema.columns WHERE column_name = 'desired_column_name';
select distinct table_name
from information_schema.columns
where column_name in ('ColumnA')
and table_schema='YourDatabase';
and table_name in
(
select distinct table_name
from information_schema.columns
where column_name in ('ColumnB')
and table_schema='YourDatabase';
);
That ^^ will get the tables with ColumnA and ColumnB instead of ColumnA or ColumnB like the accepted answer
SELECT DISTINCT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME LIKE '%city_id%' AND TABLE_SCHEMA='database'
The problem with information_schema is that it can be terribly slow. It is faster to use the SHOW commands.
After you select the database you first send the query SHOW TABLES. And then you do SHOW COLUMNS for each of the tables.
In PHP that would look something like
$res = mysqli_query("SHOW TABLES"); while($row = mysqli_fetch_array($res)) { $rs2 = mysqli_query("SHOW COLUMNS FROM ".$row[0]); while($rw2 = mysqli_fetch_array($rs2)) { if($rw2[0] == $target) .... } }
Success story sharing
DATABASE()
instead of a string to search in the currently selected database.