In my table "accounts" I have four columns like
user, pass, column1, column2
I need to insert value into column2, where user='special_user_value'.
How can I do this?
UPDATE accounts
SET column2 = 'New Value'
WHERE user = 'special_user_value';
You don't "insert values" into a column. You insert a row, that has a value for all the columns you specified in the table creation; Just like a real table, or excel sheet for that matter.
If you need to change a column value for a specific row, you can use UPDATE:
UPDATE table_name SET column2='new value' WHERE user='special_user_value'
This is a really basic example. If you follow the link I provided for UPDATE, you may learn more about changing table values for a specific row.
If are you looking for actually inserting a new row with a specific value for that column, there's INSERT INTO you could follow to achieve that.
Use update Query like:
Update table_nm set field1=value1, Field2=value2 Where condition;
UPDATE Accounts SET column2='NewValue' WHERE user='special_user_value'
Related
For example i have table with a different field names(column), lets say 5 columns and all of them are empty. And i wanted to insert data in one specific column. Is it possible? I'm looking for example of this, but unlucky to find one. Most of insert into statements examples required all columns to be filled. If possible, can you give me the correct syntax? I'm sorry if i'm lacking research or it's already been asked, it's ok if you will redirect me to the link.
If you want insert on column3, leaving empty the other:
INSERT INTO table_name (column1,column2,column3,column4,column5)
VALUES ("","","VALUE","","");
The other part of program would UPDATE the other columns:
UPDATE table_name
SET column1=value1,column2=value2,column4=value4,column5=value5
WHERE some_column=some_value;
The documentation on how to construct an INSERT INTO statement is here: INSERT INTO Statement (Microsoft Access SQL).
But basically, you just need to be explicit about which columns you want to insert values for, and omit the other ones, like this:
INSERT INTO table (colname) VALUES ('colvalue')
What happens to the fields you omit? The documentation says:
When you do not specify each field, the default value or Null is inserted for missing columns.
I have a table named student which consists of (rollno, name, sem, branch)
If I want to INSERT only one value (i.e only name has to be entered) what is the query?
To insert values into specific columns, you first have to specify which columns you want to populate. The query would look like this:
INSERT INTO your_table_name (your_column_name)
VALUES (the_value);
To insert values into more than one column, separate the column names with a comma and insert the values in the same order you added the column names:
INSERT INTO your_table_name (your_column_name_01, your_column_name_02)
VALUES (the_value_01, the_value_02);
If you are unsure, have a look at W3Schools.com. They usually have explanations with examples.
insert into student(name) values("The name you wan to insert");
Be careful not to forget to insert the primary key.
First, if the table is all empty, just wanna make the column 'name' with values, it is easy to use INSERT INTO. https://www.w3schools.com/sql/sql_insert.asp.
`INSERT INTO TABLE_NAME (COLUMN_NAME) VALUES ("the values")`
Second, if the table is already with some values inside, and only wanna insert some values for one column, use UPDATE. https://www.w3schools.com/sql/sql_update.asp
UPDATE table_name SET column1 = value1 WHERE condition;
insert into student (name)
select 'some name'
or
insert into student (name)
values ('some name')
Following works if other columns accept null or do have default value:
INSERT INTO Student (name) VALUES('Jack');
Further details can be found from the Reference Manual:: 13.2.5 INSERT Syntax.
Execute this query, if you want the rest of columns as "#", do insert # inside the single quote which is left blank in query.
Also, there is no need of defining column name in the query.
insert into student values('','your name','','');
Thanks...
I there a way to update a row without mentioning fields name ?
I mean something like:
UPDATE table SET VALUES(1, 'name', 'family')
instead of:
UPDATE table SET id=1, name='name', family='family'
update
I'm using INSERT ON DUPLICATE KEY UPDATE and don't want to use REPLACE function because REPLACE function will cause a record to be removed, and inserted at the end, which will cause the indexing to get broken apart, decreasing the efficiency of the table.
If you specify the values in the same order as the table definition you could use
REPLACE INTO table VALUES(1, 'name', 'family');
Note that this will replace the entire row, so you must specify all the values you need!
You cannot do like that with mysql, as set clause indicates which columns to modify and the values they should be given
FYI: http://dev.mysql.com/doc/refman/5.0/en/update.html
I am currently using MySQL. I have a table that has an auto_increment 'id' field, and an 'imgname' field containing a string that is the file name of an image.
I need to generate the 'imgname' value using the auto_increment value that is create by an INSERT INTO statement. The problem is, I don't know this value until I can use mysql_insert_id, AFTER the insert query has run. I would like to know if it's possible to access this value DURING the insert query somehow and then use it to generate my string in the query statement.
Thanks in advance.
I would keep the id and imgname independent of each other and combine the two on SELECT when needed. If the need is frequent enough, create a view.
Have a look at LAST_INSERT_ID() function. If performance is not an issue, INSERT regularly, and then UPDATE using LAST_INSERT_ID(), like:
UPDATE table SET name = CONCAT(name, "-", LAST_INSERT_ID()) WHERE id = LAST_INSERT_ID();
I've got a table with a column, lets call it table_column that is currently null for all rows of the table. I'd like to insert the value "test" into that column for all rows. Can someone give me the SQL for this?
I've tried INSERT INTO table (table_column) VALUES ("test"); but that only populates that last row. How do I do all of the rows at once?
You're looking for UPDATE not insert.
UPDATE mytable
SET table_column = 'test';
UPDATE will change the values of existing rows (and can include a WHERE to make it only affect specific rows), whereas INSERT is adding a new row (which makes it look like it changed only the last row, but in effect is adding a new row with that value).
This is because in relational database terminology, what you want to do is not called "inserting", but "UPDATING" - you are updating an existing row's field from one value (NULL in your case) to "test"
UPDATE your_table SET table_column = "test"
WHERE table_column = NULL
You don't need the second line if you want to update 100% of rows.
To update the content of existing rows use the UPDATE statement:
UPDATE table_name SET table_column = 'test';
What you're actually doing is adding rows. To update the content of existing rows use the UPDATE statement:
UPDATE table SET table_column = 'test';
UPDATE `table` SET table_column='test';
The SQL you need is:
Update table set table_column = "test";
The SQL you posted creates a new row rather than updating existing rows.
To create a new empty column and fill it with the same value (here 100) for every row (in Toad for Oracle):
ALTER TABLE my_table ADD new_column INT;
UPDATE my_table SET new_column = 100;