SELECT CONCAT(list + users.fname,' ',users.lname,',') AS listīut neither of them do what I need it to do.īottom line, I want one row per project on the given criteria with a column assignedTo which has a comma seperated list of the names of the people assigned to the project. SELECT list = CONCAT(list + users.fname,' ',users.lname,',') Sample Data First, here’s some sample data. This article provides examples that demonstrate the T-SQL STRINGAGG () function. This works in much the same way to MySQL’s GROUPCONCAT () function. In the subquery (which is obviously not corrent) I want it to return a comma seperated list of the the 'fname lname' as a column name assignedTo which I can parse out later and do whatever I want when I display the query data. Transact-SQL now has the STRINGAGG () function, which concatenates the values of string expressions and places separator values between them. There can be multiple users though which will return multiple rows. Then I have to join the usernames to the users table to get the first and last names. You can see that I have to join the projectID from the project table to the projassignment which gets me the usernames. If values count is fixed and numbers count is equal to it. A common usage of the CONCATWS () function is to create a comma-delimited list. SELECT DISTINCT CONCAT(SUBSTRINGINDEX(SUBSTRINGINDEX(numbers,',',num),',',-1),'sub',id) results FROM table, (SELECT 1 num UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) nums The numbers count in nums subquery is to be equal or greater than max values count in CSV field. LEFT JOIN projassignment ON projects.projID = projassignment.projID If you just use the CONCAT () function, you’d have no separator (unless you explicitly added a separator as an argument between each string argument). SELECT CONCAT(users.fname,' ',users.lname) Projects: projID,createdBy,createdOn,projName,projDesc,active I need to query the project table for all projects of a specific supervisor which includes a field that is a comma seperated list of the names of the people the project is assigned to. I also have a users table which stores the first and last name of the user based on the username.
#Mysql show tables concat comma delimited how to
I have a table with a project ID and another table with the project ID and the usernames of the people assigned to the project. In this post, well show how to split our comma-separated string into a table of values for easier analysis in MySQL. Regards guys.I have a problem I just can't seem to solve. Where table_schema = 'db2' and table_name = 'table2' ) as i2Īnd the obvious result is dob that is present in table1 and not in table2. Where table_schema = 'db1' and table_name = 'table1' ) as i1 Id int not null auto_increment primary key, I add an example of two different databases on the same server. As you said your problem was quite different because it concerned with different servers. So, you can even compare fields between tables with a left join for example.Įdit. concat: Adding string to a field data Adding / to dir name stored in MySql table Concat with null data Combining two columns to display as one using select. Information schema allows you to make queries on metadata. same order in which the columns are defined in the CREATE TABLE, separated by commas.
#Mysql show tables concat comma delimited manual
Where table_schema = 'database_name' and table_name = 'table_name'Įdit. For detailed syntax, check MySQL manual SQL Statement Syntax.
Take a look at the information_lumns table select group_concat(column_name order by ordinal_position) The results are a list of any columns that exist in the first database and not in the second. We actually have tables like that, but the csv columns are meant to be human readable and not ever used for joining. WHERE table_schema = 'db_name' AND table_name = 'tbl_name' AND column_name NOT IN ('id', 'name', 'field1', 'field2') Then I can use this query to compare: SELECT GROUP_CONCAT(column_name ORDER BY ordinal_position) That gives me a list that looks like this: 'id', 'name', 'field1', 'field2'
WHERE table_schema = 'db_name' AND table_name = 'tbl_name' Thanks for the answers, guys! Applying your answers to the question, this is my final SQL to get the column names: SELECT CONCAT("'", GROUP_CONCAT(column_name ORDER BY ordinal_position SEPARATOR "', '"), "'") AS columns
What I am after is a comma-delimited list that I can then take to the live server and do: SHOW COLUMNS FROM table_name WHERE NOT IN ()Īny thoughts on how best to do this - either by correcting me in my own approach, or by another means all together? Obviously, the above SQL does not work.Ī note: The servers are entirely separate and may not communicate with each other, so no direct comparison is possible. I'd like to do something like this: SELECT GROUP_CONCAT(Field) FROM (SHOW COLUMNS ON table_name) GROUP BY Field I am comparing database tables on a development server against a live server, looking for column name changes, new columns, and columns that have been dropped.
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