To avoid the incorrect datetime value error, you can use the STR_TO_DATE() method.As we know the datetime format is YYYY-MM-DD and if you won’t insert in the same format, the error would get generated.Let us see what actually lead to this error. For this, let us create a new table. The query to create a table is as followsmysql> create table CorrectDatetimeDemo    - > (    - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    - > ArrivalTime datetime   - > ); Query OK, 0 rows affected (0.63 sec)The occurs when we try to include a ... Read More

You need to use ALTER command to add a created at column to an already created table in MySQL.Let us first create a table. The query to create a table is as follows. Here is your table without the “created at” columnmysql> create table formDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Email varchar(128), - > PhoneNumber varchar(15), - > Country varchar(30), - > Platform varchar(40) - > ); Query OK, 0 ... Read More

Yes, you can concatenate strings with || in MySQL with the help of sql_mode. Set the sql_mode to PIPES_AS_CONCAT.The syntax is as followsset sql_mode=PIPES_AS_CONCAT;The following is the syntax to concat with the help of ||.SELECT ‘yourValue' || yourColumName AS anyAliasName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table PipeConcatDemo    - > (    - > Name varchar(20)    - > ); Query OK, 0 rows affected (0.93 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into PipeConcatDemo values('Larry'); Query ... Read More

To know how many rows are in a ySQL database table, you need to use aggregate function COUNT(*).The syntax is as followsSELECT COUNT(*) FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table CountRowsDemo    - > (    - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    - > Name varchar(20)    - > ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into CountRowsDemo(Name) values(NULL); Query OK, 1 row affected (0.15 sec) mysql> ... Read More

Yes, for this MySQL comes with a NOT IN.The syntax is as followsSELECT *FROM yourTableName WHERE yourColumnName NOT IN(1, 2, 7);To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table User_informations    - > (    - > UserId int,    - > UserName varchar(20)    - > ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into User_informations values(12, 'Maxwell'); Query OK, 1 row affected (0.17 sec) mysql> insert into User_informations values(7, 'David'); Query OK, 1 ... Read More

There is no concept of TOP in MySQL. The alternate way to write your query is using LIMIT i.e to select 2 records, you need to use TOP 2. Let us see the syntax for the same in MySQLSELECT *FROM yourTableName ORDER BY yourColumnName DESC LIMIT 2;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table Top2Demo    - > (    - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    - > Name varchar(20),    - > Age int    - > ); Query OK, 0 rows ... Read More

To get the server_id, use the system defined variable @@server_id. You cannot use only a single @ as user defined variable for server_id.The syntax is as followsSELECT@@ server_idAs an alternate, you can use SHOW VARIABLES command.The syntax is as followsSHOW VARIABLES LIKE ‘server_id’;Case 1The query is as followsmysql> SELECT @@server_id as SERVER_ID;The following is the output+-----------+ | SERVER_ID | +-----------+ |         1 | +-----------+ 1 row in set (0.00 sec)Case 2The query is as followsmysql> show variables like 'server_id';The following is the output+---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | ... Read More

To check if value exists in a comma separated list, you can use FIND_IN_SET() function.The syntax is as followsSELECT *FROM yourTablename WHERE FIND_IN_SET(‘yourValue’, yourColumnName) > 0;Let us first create a table. The query to create a table is as followsmysql> create table existInCommaSeparatedList - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(200) - > ); Query OK, 0 rows affected (0.68 sec)Now you can insert some records in the table using insert command.The query is as followsmysql> insert into existInCommaSeparatedList(Name) values('John, ... Read More

The following is the syntax of END IF statement in MySQLIF yourCondition THEN yourStatement ELSE yourStatement END IFHere is the demo of END IF statement while creating a stored proceduremysql> DELIMITER // mysql> CREATE PROCEDURE Sp_Test( IN value INT ) - > BEGIN - > IF value < 10 THEN - > select 'Your value is less than 10'; - > ELSE - > select 'Your value is greater than 10'; - > END IF; ... Read More

To get the longest varchar length, you need to use CHAR_LENGTH().The syntax is as followsSELECT Max(CHAR_LENGTH(yourColumnName)) AS anyAliasName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table CharLengthDemo    - > (    - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    - > Sentence varchar(255)    - > ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into CharLengthDemo(Sentence) values('Java is an object oriented programming language' - > ); Query OK, 1 row ... Read More