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MySQL Articles
Page 292 of 355
Comparing two strings in MySQL?
To compare two strings, which are numbers, let us first create a table. Following is the query −mysql> create table compareTwoStringsDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value varchar(100) -> ); Query OK, 0 rows affected (0.52 sec)Following is the query to insert some records in the table using insert command −mysql> insert into compareTwoStringsDemo(Value) values('1235667'); Query OK, 1 row affected (0.66 sec) mysql> insert into compareTwoStringsDemo(Value) values('999999'); Query OK, 1 row affected (0.11 sec) mysql> insert into compareTwoStringsDemo(Value) values('999888'); Query OK, 1 row affected (0.17 sec) mysql> ...
Read MoreHow to format number with “.” as thousand separators, and “,” as decimal separator?
You can use format() function for the separators. It will work in MySQL version greater than or equal to 5.5. We are using the version 8.0.12mysql> select version(); +-----------+ | version() | +-----------+ | 8.0.12 | +-----------+ 1 row in set (0.00 sec)The syntax is as followsSELECT FORMAT(yourColumnName, valueAfterDecimalPoint, 'de_DE') AS anyAliasNamefrom yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table formatNumberDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Number DECIMAL(19, 1) ...
Read MoreHow to SELECT min and max value from the part of a table in MySQL?
To select min and max value from the part of a table in MySQL, use the following syntax −select min(yourColumnName) as yourAliasName1, max(yourColumnName) as yourAliasName2 from (select yourColumnName from yourTableName limit yourLimitValue) tbl1;Let us first create a table. Following is the query −mysql> create table MinAndMaxValueDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value int -> ); Query OK, 0 rows affected (0.52 sec)Insert records in the table using insert command. Following is the query −mysql> insert into MinAndMaxValueDemo(Value) values(10); Query OK, 1 row affected (0.16 sec) mysql> insert into MinAndMaxValueDemo(Value) ...
Read MoreMySQL UPDATE query where id is highest AND field is equal to variable?
The syntax is as followsupdate yourTableName set yourColumnName1=yourValue where yourColumnName2=yourValue order by yourIdColumnName DESC LIMIT 1;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table UpdateWithHighestDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserStatus tinyint, -> UserRank int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into UpdateWithHighestDemo(UserStatus, UserRank) values(1, 78); Query OK, 1 row affected (0.12 sec) mysql> insert into UpdateWithHighestDemo(UserStatus, UserRank) values(0, 118); Query ...
Read MoreStored procedure using variable in LIMIT expression?
Let us firs create a tablemysql> create table LimitWithStoredProcedure -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(10) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into LimitWithStoredProcedure(Name) values('John'); Query OK, 1 row affected (0.15 sec) mysql> insert into LimitWithStoredProcedure(Name) values('Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into LimitWithStoredProcedure(Name) values('Maxwell'); Query OK, 1 row affected (0.28 sec) mysql> insert into LimitWithStoredProcedure(Name) values('Bob'); Query OK, 1 row affected (0.24 sec) mysql> insert into LimitWithStoredProcedure(Name) values('David'); Query ...
Read MoreMySQL query to get the max value with numeric values in varchar field?
To get the max value, use the max() function. Let us create a table first −mysql> create table findMaxValueInVarcharField -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value varchar(200) -> ); Query OK, 0 rows affected (1.09 sec)Following is the query to insert some records in the table using insert command −mysql> insert into findMaxValueInVarcharField(Value) values('200'); Query OK, 1 row affected (0.14 sec) mysql> insert into findMaxValueInVarcharField(Value) values('1000'); Query OK, 1 row affected (0.25 sec) mysql> insert into findMaxValueInVarcharField(Value) values('899474'); Query OK, 1 row affected (0.18 sec) mysql> insert into ...
Read MoreSelecting Random Result from MySQL?
You need to use rand() function to select random result from MySQL.The syntax is as followsselect *from yourTableName order by rand() limit 1;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table selectRandomRecord -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into selectRandomRecord(StudentName) values('John'); Query OK, 1 row affected (0.17 sec) mysql> insert into selectRandomRecord(StudentName) values('Carol'); Query OK, ...
Read MoreConvert Date not in a proper format with MySQL?
Assume that the date is in varchar data type i.e. not in the date format.Let us first create a table. Following is the query −mysql> create table convertDateDemo -> ( -> AdmissionDate varchar(200) -> ); Query OK, 0 rows affected (0.63 sec)Following is the query to insert some records in the table using insert command −mysql> insert into convertDateDemo values('April 04 2019'); Query OK, 1 row affected (0.18 sec) mysql> insert into convertDateDemo values('May 05 2018'); Query OK, 1 row affected (0.16 sec) mysql> insert into convertDateDemo values('January 01 2012'); Query OK, 1 row affected ...
Read MoreMySQL replace values in a table?
To replace values in a table, use the CASE statement. To understand the concept, let us create a table. The query to create a table is as followsmysql> create table replaceValueDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(10), -> isGreaterThan18 varchar(10) -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into replaceValueDemo(Name, isGreaterThan18) values('John', 'YES'); Query OK, 1 row affected (0.24 sec) mysql> insert into replaceValueDemo(Name, isGreaterThan18) values('Carol', 'NO'); Query OK, 1 row affected (0.16 sec) ...
Read MoreHow to SELECT all values from a table only once if they're duplicated?
You can use distinct keyword to select all values from a table only once if they are repeated.The syntax is as followsselect distinct yourColumnName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows.mysql> create table displayOnlyDistinctValue -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(100), -> UserAge int -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command.The query is as follows.mysql> insert into displayOnlyDistinctValue(UserName, UserAge) values('Larry', 23); Query OK, 1 row affected ...
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