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SQL 2021-09-19 01:04:02
sql make sure every user is unqiuew
create table user( user_id INT auto_increment PRIMARY KEY, username varchar(50) not null, avator varchar(50), gender boolean not null, phone varchar(20), unique(username) ); create table journey( id INT auto_inc... Add solution -
SQL 2021-09-18 18:35:02
create table in mysql mariadb primary key foreign key
CREATE TABLE IF NOT EXISTS `scores` ( `ID` int(11) NOT NULL AUTO_INCREMENT, UserId int(11) NOT NULL, `NICKNAME` varchar(50) NOT NULL, `HIGHSCORE` int(11) NOT NULL, PRIMARY KEY (`ID`), FOREIGN KEY (UserId) REFERENCES USER(Id) ); Add solution -
SQL 2021-09-17 14:15:03
mysql check if not null
SELECT * FROM table WHERE YourColumn IS NOT NULL; Add solution -
SQL 2021-09-17 07:40:02
HOW TO RUN QUERRY ON MICROSOFT SQLSERVER
USE [TutorialDB] -- Create a new table called 'Customers' in schema 'dbo' -- Drop the table if it already exists IF OBJECT_ID('dbo.Customers', 'U') IS NOT NULL DROP TABLE dbo.Customers GO -- Create the table in the specified schema CREATE TABLE dbo.Custom... Add solution -
SQL 2021-09-16 17:27:02
sql script to remove default from column
DECLARE @tableName VARCHAR(MAX) = '<MYTABLENAME>' DECLARE @columnName VARCHAR(MAX) = '<MYCOLUMNAME>' DECLARE @ConstraintName nvarchar(200) SELECT @ConstraintName = Name FROM SYS.DEFAULT_CONSTRAINTS WHERE PARENT_OBJECT_ID = OBJECT_ID(@tableNam... Add solution