insert-into

I have a code that gets data from Tables 1 and 2, and then inserts new rows into Table 3. My problem is that the code adds records that already exist. How can I prevent duplicate errors from being inserted, when the combination of groupid and userid in Table C already exists? INSERT INTO mdl_groups_members (groupid,userid) SELECT l.mgroup AS moodle, r.id AS mdl_user FROM moodle AS l JOIN mdl_user AS r ON l.orders_id = r.id WHERE l.mgroup > 0 Here's the table before I ran the script: id groupid userid timeadded 1 1 1 1372631339 2 4 2 1372689032 3 8 3 1373514395 4 3 4 1373514395 Here's the table

I have a stored procedure with two table variables (@temp and @temp2). How can I select the values from both temp tables (Both table variables contain one row) and insert them all in one table ? I tried the following but this didn't work and I got the error that the number of SELECT and INSERT statements does not match. DECLARE @temp AS TABLE ( colA datetime, colB nvarchar(1000), colC varchar(50) ) DECLARE @temp2 AS TABLE ( colD int ) ... INSERT INTO MyTable ( col1, col2, col3, col4 ) SELECT colD FROM @temp2, colA FROM @temp, colB FROM @temp, colC FROM @temp Many thanks for any help with this,

I created a table in my database: CREATE TABLE official_receipt( student_no INT UNSIGNED, academic_year CHAR(8), trimester ENUM('1', '2', '3'), or_no MEDIUMINT UNSIGNED, issue_date DATE NOT NULL, received_from VARCHAR(255) NOT NULL, amount_of DECIMAL(8,2) NOT NULL, issued_by VARCHAR(255), doc_type ENUM('FULL', 'DOWN', 'INST') NOT NULL, form_of_payment ENUM('CASH', 'INST') NOT NULL, PRIMARY KEY (student_no, academic_year, trimester, or_no) ); I inserted some values: INSERT INTO official_receipt(student_no , academic_year, trimester, or_no, issue_date, received_from, amount_of, issued_by, doc

I created a new migration, where is mentioned ... t.timestamps in the created table are added these two columns ... | created_at | datetime | NO (Null) | | NULL (Default) | | updated_at | datetime | NO (Null) | | NULL (Default) | ... When I want to create a new item, I always get the error message Mysql2::Error: Field 'created_at' doesn't have a default value: INSERT INTO `table_name` (`first_col`, `second_col`) VALUES ('a', 'b') Am I missing something? I sent this miniapp to a friend of mine and he is able to run successfully run it -> the record is created in database. What am I missing? I

I created a database with one table in MySQL: CREATE DATABASE iac_enrollment_system; USE iac_enrollment_system; CREATE TABLE course( course_code CHAR(7), course_desc VARCHAR(255) NOT NULL, course_chair VARCHAR(255), PRIMARY KEY(course_code) ); I tried to insert a record using Java: // STEP 1: Import required packages import java.sql.*; import java.util.*; public class SQLInsert { // JDBC driver name and database URL static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; static final String DB_URL = "jdbc:mysql://localhost:3306/iac_enrollment_system"; // Database credentials static final