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MySQL Articles
Page 293 of 355
Can we store CSS color values in MySQL?
Yes, we can. In order to store CSS color value, you can use CHAR(6) without # symbol for hexadecimal. Let us see an example and create a tablemysql> create table storeCSSColorDemo -> ( -> CSSValue char(6) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command. The records here are individual color values in hexadecimal, for which we have used char(6)mysql> insert into storeCSSColorDemo values('FF0000'); Query OK, 1 row affected (0.13 sec) mysql> insert into storeCSSColorDemo values('FFA500'); Query OK, 1 row affected (0.86 sec) ...
Read MoreHow to add a random number between 30 and 300 to an existing field in MySQL?
Let us first create a demo tablemysql> create table RandomNumberDemo -> ( -> MyNumber int -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into RandomNumberDemo values(17); Query OK, 1 row affected (0.20 sec) mysql> insert into RandomNumberDemo values(18); Query OK, 1 row affected (0.12 sec) mysql> insert into RandomNumberDemo values(29); Query OK, 1 row affected (0.49 sec)Display all records from the table using select statement. The query is as follows −mysql> select *from RandomNumberDemo;The following is the output+----------+ | MyNumber | ...
Read MoreMySQL replication: temporarily prevent specific SQL statements replicating to the slaves?
To achieve this, you need to set sql_log_bin to 0. To understand the concept, let us create a table. The query to create a table is as followsmysql> create table SQLStatementsDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into SQLStatementsDemo(UserName) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into SQLStatementsDemo(UserName) values('Carol'); Query OK, 1 row affected (0.14 sec) mysql> insert into SQLStatementsDemo(UserName) values('Bob'); Query ...
Read MoreHow to see spaces in data when selecting with MySQL command line client?
Use quote() function for this. The syntax is as follows −select yourColumnName, quote(yourColumnName) from yourTableName;To understand the concept, let us create a table. The query to create a table is as follows −mysql> create table seeSpacesDemo -> ( -> spaceValue varchar(10) -> ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into seeSpacesDemo values(""); Query OK, 1 row affected (0.70 sec) mysql> insert into seeSpacesDemo values(" "); Query OK, 1 row affected (0.45 sec) mysql> insert into seeSpacesDemo values(" "); Query OK, 1 ...
Read MoreHow can I sum columns across multiple tables in MySQL?
To sum columns across multiple tables, use UNION ALL. To understand the concept, let us create first table. The query to create first table is as followsmysql> create table Products1 -> ( -> ProductId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ProductName varchar(20), -> ProductPrice int -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the first table using insert command. The query is as follows −mysql> insert into Products1(ProductName, ProductPrice) values('Product-1', 100); Query OK, 1 row affected (0.22 sec) mysql> insert into Products1(ProductName, ProductPrice) values('Product-2', 200); Query OK, 1 row affected ...
Read MoreHow to find capital letters with Regex in MySQL?
You can use REGEXP BINARY for thisselect *from yourTableName where yourColumnName REGEXP BINARY '[A-Z]{2}';Let us first create a tablemysql> create table FindCapitalLettrsDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentFirstName varchar(20) -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into FindCapitalLettrsDemo(StudentFirstName) values('JOHN'); Query OK, 1 row affected (0.24 sec) mysql> insert into FindCapitalLettrsDemo(StudentFirstName) values('Carol'); Query OK, 1 row affected (0.15 sec) mysql> insert into FindCapitalLettrsDemo(StudentFirstName) values('bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into ...
Read MoreHow to retrieve a random row or multiple random rows in MySQL?
You can use RAND() method for this. To retrieve a random row, use the following syntaxSELECT *FROM yourTableName ORDER BY RAND() LIMIT yourIntegerNumber;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table gettingRandomRow -> ( -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerName varchar(100) -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into gettingRandomRow(CustomerName) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into gettingRandomRow(CustomerName) values('Robert'); ...
Read MoreMySQL command-line tool: How to find out number of rows affected by a DELETE?
You can use row_count() at the end for this. Let us first create a table −mysql> create table rowAfftectedByDeleteDemo -> ( -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerName varchar(20) -> ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Carol'); Query OK, 1 row affected (0.10 sec) mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Bob'); Query OK, 1 row affected (0.09 sec) mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Sam'); Query ...
Read MoreReset the primary key to 1 after deleting all the data in MySQL?
To reset the primary key to 1 after deleting the data, use the following syntaxalter table yourTableName AUTO_INCREMENT=1; truncate table yourTableName;After doing the above two steps, you will get the primary key beginning from 1.To understand the above concept, let us create a table. The query to create a table is as followsmysql> create table resettingPrimaryKeyDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into resettingPrimaryKeyDemo values(); Query OK, 1 row ...
Read MoreMySQL GROUP BY date when using datetime?
To GROUP BY date while using datetime, the following is the syntax −select *from yourTableName GROUP BY date(yourColumnName);To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table groupByDateDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20), -> UserPostDatetime datetime -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into groupByDateDemo(UserName, UserPostDatetime) values('Larry', '2018-01-02 13:45:40'); Query OK, 1 row affected (0.18 sec) mysql> insert ...
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