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I have a table table1 with three columns and a bunch of rows:
[key_col|col_a|col_b] I want to update col_a with a set of values (i.e. leaving col_b unchanged), something like this:
INSERT INTO table1 AS t1 (key_col, col_a) VALUES ("k1", "foo"), ("k2", "bar");
But it doesn't work, how do I do this?
921
The syntax to modify a column in a table in MySQL (using the ALTER TABLE statement) is: ALTER TABLE table_name MODIFY column_name column_definition [ FIRST | AFTER column_name ]; table_name. The name of the table to modify.
First, specify the table name that you want to change data in the UPDATE clause. Second, assign a new value for the column that you want to update. In case you want to update data in multiple columns, each column = value pair is separated by a comma (,). Third, specify which rows you want to update in the WHERE clause.
The UPDATE statement in SQL is used to update the data of an existing table in database. We can update single columns as well as multiple columns using UPDATE statement as per our requirement. UPDATE table_name SET column1 = value1, column2 = value2,...
UPDATE `table_name` is the command that tells MySQL to update the data in a table . SET `column_name` = `new_value' are the names and values of the fields to be affected by the update query. Note, when setting the update values, strings data types must be in single quotes.
You have to use UPDATE instead of INSERT:
For Example:
UPDATE table1 SET col_a='k1', col_b='foo' WHERE key_col='1'; UPDATE table1 SET col_a='k2', col_b='bar' WHERE key_col='2'; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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