For this, use the INSERT() function from MySQL. The INSERT(str, pos, len, newstr) returns the string str, with the substring beginning at position pos and len characters long replaced by the string newstr. Returns the original string if pos is not within the length of the string.It replaces the rest ... Read More

Let us first create a table −mysql> create table DemoTable (    Name varchar(40),    Score int ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable ... Read More

For this, you can use subquery. Let us first create a table −mysql> create table DemoTable (    StudentName varchar(40),    StudentMarks int ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 56); Query OK, 1 row affected ... Read More

Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    FileID int ) AUTO_INCREMENT=100; Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FileID) values(50); Query OK, 1 row affected (0.17 ... Read More

Use CREATE TABLE IF NOT EXISTS for this as shown in the below syntax −create table if not exists yourTableName (    yourColumnName1 dataType,    yourColumnName2 dataType,    yourColumnName3 dataType,    .    .    N ) as select yourValue1 as yourColumnName1 , yourValue2 as yourColumnName2 , yourValue3 as yourColumnName3, ... Read More

Let us first create a table −mysql> create table DemoTable (    CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ProductAmount int,    CustomerCountryName varchar(10) ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ProductAmount, CustomerCountryName) values(190, 'US'); Query OK, ... Read More

To display a single quote text, use double quotes like if you want to write You’ve, then write You've while inserting i.e. with double-quotes. Let us first create a table −mysql> create table DemoTable (    Note text ); Query OK, 0 rows affected (0.57 sec)Insert some records in the ... Read More

To update only blank cells to NULL, use NULLIF() in MySQL. Let us first create a table −mysql> create table DemoTable (    Name varchar(50) ); Query OK, 0 rows affected (1.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Mike'); Query OK, 1 row ... Read More

Let us see the first syntax, which uses DISTINCT in MAX() −select max(DISTINCT yourColumnName) from yourTableName;The second syntax is as follows. It isn’t using DISTINCT −select max( yourColumnName) from yourTableName;NOTE − Both the above queries give the same result with or without a DISTINCT keyword. MySQL internally converts MAX(yourColumnName) to ... Read More

For this, use COALESCE(). Let us implement a stored procedure to check if the local variable is null −mysql> DELIMITER // mysql> CREATE PROCEDURE local_VariableDemo()    BEGIN    DECLARE value1 int;    DECLARE value2 int;    select value1, value2;    select    concat('After checking local variable is null the sum ... Read More