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MySQL Articles
Page 292 of 355
Convert MySQL Unix-Timestamp format to date format?
To achieve this, the following is the syntaxselect date_format(from_unixtime(yourColumnName), '%b %d, %Y %l:%i %p PDT') from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table unixTimeStampFormatDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> MyTimeStampValue bigint -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into unixTimeStampFormatDemo(MyTimeStampValue) values(1334428200); Query OK, 1 row affected (0.20 sec) mysql> insert into unixTimeStampFormatDemo(MyTimeStampValue) values(1513881000); Query OK, 1 row affected (0.15 ...
Read MoreExclude certain columns from SHOW COLUMNS in MySQL?
Let us first create a demo tablemysql> create table excludeCertainColumnsDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentAge int, -> StudentMarks int, -> StudentAddress varchar(200) -> ); Query OK, 0 rows affected (0.50 sec)Now you can check the description of table with the help of desc command. The query is as follows −mysql> desc excludeCertainColumnsDemo;The following is the output+----------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+----------------+ | ...
Read MoreHow to fasten MySQL inserts?
You can speed the MySQL insert when you are inserting multiple records at the same time with the help of the following syntaxSTART TRANSACTION insert into insertDemo(yourColumnName1, yourColumnName2, ...N) values(yourValue1, yourValue2, ....N), (yourValue1, yourValue2, ....N), .......N commitLet us first create a demo tablemysql> create table insertDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentAge int -> ); Query OK, 0 rows affected (0.72 sec)Insert multiple records at the same time. The query is as follows −mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) mysql> insert into ...
Read MoreAdding/ concatenating text values within a MySQL SELECT clause?
To add/ concatenate text values within a select clause, you can use concat() function.Let us create a tablemysql> create table ConcatenatingDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20), -> UserCountryName varchar(20) -> ); Query OK, 0 rows affected (0.82 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into ConcatenatingDemo(UserName, UserCountryName) values('John', 'US'); Query OK, 1 row affected (0.14 sec) mysql> insert into ConcatenatingDemo(UserName, UserCountryName) values('Carol', 'UK'); Query OK, ...
Read MoreAdd DATE and TIME fields to get DATETIME field in MySQL?
You can use CONCAT() function to set date and time fields to get DATETIME field.Let us create a demo tablemysql> create table getDateTimeFieldsDemo -> ( -> ShippingDate date, -> ShippingTime time, -> Shippingdatetime datetime -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into getDateTimeFieldsDemo(ShippingDate, ShippingTime) values('2018-01-21', '09:45:34'); Query OK, 1 row affected (0.16 sec) mysql> insert into getDateTimeFieldsDemo(ShippingDate, ShippingTime) values('2013-07-26', '13:21:20'); Query OK, 1 row affected (0.13 sec) mysql> ...
Read MoreHow do I stop a MySQL decimal field from being rounded?
You can stop rounding decimal field with the help of DECIMAL() function. Here is the demo of a rounded decimal field. For our example, let us first create a demo tablemysql> create table stopRoundingDemo -> ( -> Amount DECIMAL(7) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into stopRoundingDemo values(7836.783); Query OK, 1 row affected, 1 warning (0.43 sec) mysql> insert into stopRoundingDemo values(1737.67); Query OK, 1 row affected, 1 warning (0.23 sec) mysql> insert into stopRoundingDemo values(110.50); Query OK, 1 ...
Read MoreHow to determine if a value appears in a GROUP BY group in MySQL?
You can use aggregate function SUM() along with IF to determine if a value appears in a GROUP BY group.Let us first create a demo tablemysql> create table GroupbygroupDemo -> ( -> UserId int, -> UserName varchar(20) -> ); Query OK, 0 rows affected (1.48 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into GroupbygroupDemo values(10, 'John'); Query OK, 1 row affected (0.14 sec) mysql> insert into GroupbygroupDemo values(10, 'Carol'); Query OK, 1 row affected (0.08 sec) mysql> insert into ...
Read MoreMySQL query to combine two columns in a single column?
You can use COALESCE() function for this. In the COALESCE() function, it returns the first NON NULL value from the column. To understand the concept, let us first create a demo tablemysql> create table combineTwoColumnsDemo -> ( -> UserId int, -> UserName varchar(20), -> UserAge int -> ); Query OK, 0 rows affected (1.12 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into combineTwoColumnsDemo values(101, 'John', 23); Query OK, 1 row affected (0.16 sec) mysql> insert into combineTwoColumnsDemo values(102, 'Carol', 20); Query OK, 1 row affected (0.14 ...
Read MoreDelete one row and reorder the others with the correct ID in MySQL?
To understand the concept, let us first create a table. The query to create a table is as followsmysql> create table ReorderSortDemo -> ( -> UserId int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ReorderSortDemo values(14); Query OK, 1 row affected (0.13 sec) mysql> insert into ReorderSortDemo values(4); Query OK, 1 row affected (0.10 sec) mysql> insert into ReorderSortDemo values(6); Query OK, 1 row affected (0.11 sec) mysql> insert into ReorderSortDemo values(3); Query ...
Read MoreGet distinct values and count them in MySQL
To get distinct values and count them, you can use GROUP BY clause.The syntax is as followsselect yourColumnName, count(*) as anyAliasName from yourTableName group by yourColumnName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table GroupByAndCountDemo -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(100) -> ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into GroupByAndCountDemo(ClientName) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert ...
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