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MySQLi Articles
Page 238 of 341
Why I am facing a problem using the field 'from' in SQL query?
You cannot use from as a column name directly because from is a reserved word in MySQL. To avoid this, you need to use backtick symbol. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, `from` varchar(100), Name varchar(10) ); Query OK, 0 rows affected (0.92 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`from`, Name) values('US', 'John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(`from`, Name) values('UK', 'Carol'); Query OK, 1 row affected (0.14 sec) mysql> ...
Read MoreTake off last character if a specific one exists in a string?
You can use trim() for this.Let us first create a table −mysql> create table DemoTable ( UserId varchar(100) ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command. Here, we have added a question mark (?) to the end of some of the strings −mysql> insert into DemoTable values('User123?'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('User777'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('User456'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('User133?'); Query OK, 1 ...
Read MoreWhat is the Java equivalent to MySQL's smallint?
The short is equivalent to MySQL’s small int. The Java short takes 2 bytes that has the range -32768 to 32767 while MySQL smallint also take 2 bytes with same range.Here is the demo code of short in Java −public class SmallIntAsShortDemo { public static void main(String[] args) { short value = 32767; System.out.println(value); value = -32768; System.out.println(value); // value = 32768; // System.out.println(value); } }The snapshot is as follows −This will produce the following output −32767 -32768Here is the snapshot of the output we ran in EclipseIDE −The MySQL smallint takes 2 bytes with same range.
Read MoreCreate a stored Procedures using MySQL Workbench?
Let us first create a Stored Procedure. Following is the query to create a stored procedure using MySQL Workbench.use business; DELIMITER // DROP PROCEDURE IF EXISTS SP_GETMESSAGE; CREATE PROCEDURE SP_GETMESSAGE() BEGIN DECLARE MESSAGE VARCHAR(100); SET MESSAGE="HELLO"; SELECT CONCAT(MESSAGE, ' ', 'MYSQL!!!!'); END // DELIMITER ;Here is the screenshot of stored procedure in MySQL workbench −You need to execute the above stored procedure with the help of below symbol shown in the screenshot −Now you can call the stored procedure with the help of CALL command.call SP_GETMESSAGE();The screenshot is as follows −Now again you can execute the above statement with the ...
Read MoreMySQL search results by month in format 2015-07-01 11:15:30?
Use MONTH() and YEAR() for this. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ShippingDate datetime ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ShippingDate) values('2019-01-21 10:40:21'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(ShippingDate) values('2015-07-01 11:15:30'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(ShippingDate) values('2012-12-31 10:45:56'); Query OK, 1 row affected (0.14 sec)Display all records from the table ...
Read MoreImplement GREATEST() in MySQL and update the table?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number int ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Number) values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Number) values(50); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Number) values(100); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(Number) values(190); Query OK, 1 row affected (0.12 sec)Display all ...
Read MorePerform multiplication in SELECT depending on column value in MySQL?
You can use CASE statement for this. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value1 int, Value2 int ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value1, Value2) values(10, 5); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Value1, Value2) values(20, 0); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Value1, Value2) values(40, 10); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable(Value1, Value2) ...
Read MoreSet a specific Date Format in MySQL?
To set a pecific date format, you need to use DATE_FORMAT() in MySQL. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ArrivalDate date ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ArrivalDate) values('2019-01-31'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(ArrivalDate) values('2019-04-26'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(ArrivalDate) values('2019-03-01'); Query OK, 1 row affected (0.13 sec)Display all ...
Read MoreHow to get the possible values for SET field in MySQL?
To get possible values for set field, you can use below syntax −desc yourTableName yourSetColumnName;Let us first create a table −mysql> create table DemoTable ( Game set('Chess','Pig Dice','29 Card') ); Query OK, 0 rows affected (0.60 sec)Following is the query to get available values for set field −mysql> desc DemoTable Game;This will produce the following output −+-------+-----------------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-----------------------------------+------+-----+---------+-------+ | Game | set('Chess','Pig Dice','29 Card') | YES | | NULL | | +-------+-----------------------------------+------+-----+---------+-------+ 1 row in set (0.02 sec)
Read MoreInsert multiple sets of values in a single statement with MySQL?
Let us first create a table −mysql> create table DemoTable ( UserId int, UserName varchar(20), UserAge int ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserId,UserName,UserAge) values(100,'John',25),(101,'Larry',24),(102,'Chris',22),(103,'Carol',27); Query OK, 4 rows affected (0.16 sec) Records: 4 Duplicates: 0 Warnings: 0Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+----------+---------+ | UserId | UserName | UserAge | +--------+----------+---------+ | 100 | John | 25 | | 101 | Larry | 24 | | 102 | Chris | 22 | | 103 | Carol | 27 | +--------+----------+---------+ 4 rows in set (0.00 sec)
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