![]() ![]() You have to spell out the full list of column names you want to insert. ON DUPLICATE KEY UPDATE is a MariaDB/MySQL extension to the INSERT statement that, if it finds a duplicate unique or primary key, will instead perform an UPDATE. FROM table2 īefore you ask, there is no syntax in SQL for "select * except for one column". The following SQL statement defines the 'Personid' column to be an auto-increment primary key field in the 'Persons' table: To let the. By default, the starting value for AUTOINCREMENT is 1, and it will increment by 1 for each new record. INSERT INTO table1 (col1, col2, col3) SELECT col1, col2, col3. MySQL uses the AUTOINCREMENT keyword to perform an auto-increment feature. Or else you omit the column from both the INSERT statement's column list and the SELECT statement's select-list: - No id in either case: ![]() But it's not working, it's returning the error 'Column count doesn't match value count at row 1'. Either you use null or 0 for the id column: INSERT INTO table1 SELECT 0, col1, col2, col3. I'm trying to use an INSERT INTO statement without having to entering the primary key - apparently I shouldn't need to, it should update itself. If you want table1 to generate new values, you can't do SELECT *. This means that the id values in table2 will be copied verbatim, and table1 will not generate new values. The alternative (and generally preferred) method for INSERTING into rows that may contain duplicate UNIQUE or PRIMARY KEY values is to use the INSERT. So, it's fine to INSERT INTO table1 SELECT * FROM table2 (by the way, you don't need the parentheses). If you try to insert a value of NULL or 0 or DEFAULT, or if you omit the auto-increment column from the columns in your INSERT statement, this activates the auto-increment generator. ![]() This is fine it simply overrides the auto-increment generator. If you are adding values for all the columns of the table, you do not need to specify the column names. Specify both the column names and the values to be inserted: INSERT INTO tablename (column1, column2, column3. You can insert into an auto-increment column and specify a value. It is possible to write the INSERT INTO statement in two ways: 1. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |