concat

问题 I understand that the following question may not be best practice. I have a table that has the following structure, the keyword column and title column concat into the mashup column. +------------+------------+-----------------------+ | Keyword | Title | Mashup | +------------+------------+-----------------------+ | Green | Green | Green Green | | Green | Watermelon | Green Watermelon | | Watermelon | Watermelon | Watermelon Watermelon | +------------+------------+-----------------------+ I

问题 So I have looked everywhere for an answer to this, but so far no luck. Any help is much appreciated. I am new to mysql (transferring from a filemaker pro background). I have a database where I keep information for prospects for our business. I have a question about listing information for our users to see. The INQUIRY table holds the information for each inquiry (i.e. date inquiry came in, status of the inquiry, etc.). The PROSPECT table holds the information on each prospect (potential

问题 by followed Mysql query to dynamically convert rows to columns on the basis of two columns, I have 4 table to convert dinamiacally rows into columns as RESULT TABLE A | id | stages | -----+---------- | 1 | Stage A | | 2 | Stage B | | 3 | Stage C | TABLE B | id_b | code | lessons | -------+------+-------------- | 10 | FIS | Physics | | 11 | MAT | Mathematics | | 12 | KIM | Chemistry | | 13 | BIO | Biology | TABLE C |id_c| students | -----+------------- | 20 | student 20 | | 21 | student 21 | |

问题 I have a table in Mysql where I have some D and C classes of IPs and I use this table to test if a request IP is in the database OR belongs to the C class like that: select * from My_Table where '192.168.1.12' LIKE CONCAT(ip, '%'); (where 192.168.1.12 is the request IP I am testing against my table) In my Database, if I have the ip '192.168.1' in C format, I will get a match. I was thinking about using MongoDB and have the same information in documents where each IP (either in C or D class

问题 I have a user table from which I want all values, so I have this query: SELECT tbl_user.* FROM tbl_user Now I want one additional column in this result which shows all roles this user has, (or nothing if there are no roles for the user). The role information comes from two additional tables. The first table contains these two values: userid, roleid The second table contains roleid and role_name. So the group concat needs to get all role names based on the roleid's in table1. I have tried

问题 I have tried mysql ststement for dinamically rows to column by followed here with query statement: SET @sql = NULL; SELECT GROUP_CONCAT(DISTINCT CONCAT( 'MAX(CASE WHEN col = ''', col, ''' THEN val END) as `', col, '`' ) )INTO @sql FROM ( SELECT A.id_a, D.id_c id_c, C.students students, CONCAT(B.`code`, '_', A.id_a) col, CONCAT(D.value_m, ',', D.value_n) val FROM table_a A INNER JOIN table_d D ON A.id_a =D.id_a INNER JOIN table_b B ON D.id_b=B.id_b INNER JOIN table_c C ON D.id_c=C.id_c )dd;

问题 I have some question about concatenation php string to javascript string ... for example: php variable $man = "Jamse"; and have javascript function <script> if (document.getElementById("fname").value == "") { q = false; msg = <?php echo 'Please fill first name'.$formErrors['fname'].'\n' ?>; } </script> i want to do something like this can anyone help me ? 回答1: alert('my name is: <?php echo $man; ?>' ); 回答2: alert('my name is: <?= $man; ?>'); Since PHP will insert $man on the server side, it's

问题 I know, We can copy or append elements of array. But, I have around 100 elements in an array. Is there any other way available so I can append array to first array. Consider I have this two arrays. String name1[]={"abc", "def", "ghi"}; String name2[]={"jkl", "mno", "pqr"}; I want to append name2 array at the end of name1. Please help me. would be grateful for help. 回答1: Guava provides Arrays.concat(T[], T[], Class<T>). The reason for the Class parameter, FYI, is because generic arrays have a

问题 Is there a way to add a row to an existing dataframe at a specific index? E.g. you have a dataframe with 3 rows and 1 columns df = DataFrame(x = [2,3,4]) X 2 3 4 any way to do the following: insert!(df, 1, [1]) in order to get X 1 2 3 4 I know that i could probably concat two dataframes df = [df1; df2] but i was hoping to avoid garbaging a large DF whenever i want to insert a row. 回答1: I guess you want to do it in place. Then you can use insert! function like this: julia> df = DataFrame(x =

问题 I might just be sleepy, but i've tried to concat this in various ways and it just isn't working. the $friend_id is simply a string, and shouldn't be causing a problem as far as I know. mysql_query("UPDATE users SET friends = CONCAT(friends,"$friend_id") WHERE username = '$user_logged_in'") or die mysql_error()); or mysql_query("UPDATE users SET friends = friends +" . ", " . "'$friend_id' WHERE username = '$user_logged_in'"); any ideas where im tripping up? 回答1: This is what worked in the end.