I wanted to enforce uniqueness based on 3 columns to avoid duplicate entries. While this works as expected just hit a gotcha with regard to Soft Delete for table entry. When an entry is deleted, the columns (for
I want to add a unique constraint on multiple columns. Can someone please let me know how to do specify this in the mapping document (if at all we can). Also, how does hibernate report the unqiue constraint violation? Does it give the name of the constraint that has been violated? I ...
To name aUNIQUEconstraint, and to define aUNIQUEconstraint on multiple columns, use the following SQL syntax: MySQL / SQL Server / Oracle / MS Access: ALTERTABLEPersons ADDCONSTRAINTUC_PersonUNIQUE(ID,LastName); DROP a UNIQUE Constraint
I want to make the combination (column1, column2, column3) UNIQUE. I saw some posts about this on stackoverflow but they all seem outdated : link, link or link. If I write @Index(unique = true) private String column1, column2, column3;, ...
Because of the searchmechanism for unique key constraints on multiple columns, you cannot haveidentical values in the non-null columns of a partially null composite uniquekey constraint. 二. 相关测试 2.1 测试unique index 和 uniqueconstraint
Example: How to Use UNIQUE Constraint on Multiple Columns in Postgres? Let’s create a table named bike_info that implements UNIQUE constraints on multiple columns: CREATETABLEbike_info ( bike_modelVARCHAR(50), bike_colorTEXT, reg_numVARCHAR(50)UNIQUE, ...
Because of the searchmechanism for unique key constraints on multiple columns, you cannot haveidentical values in the non-null columns of a partially null composite uniquekey constraint. 二. 相关测试 2.1 测试unique index 和 uniqueconstraint
Does GreenDao supports unique constraint on multiple columns? Equivalent of the following: createtableprojects ( _idintegerprimarykey autoincrement, project_type text, name text,unique(project_type, name) ); Yes, it supports. Create an index with all the properties and make it unique. ...
When using theUNIQUEconstraint on multiple columns, the collective values of the columns must be unique. Thisdoes notmean that each value in each column must be unique, as if you had applied theUNIQUEconstraint to each column individually. ...
Example: Unique Constraint on Multiple Columns Copy CREATE TABLE IF NOT EXISTS employee (emp_id INT, first_name VARCHAR(50) NOT NULL, last_name VARCHAR(50), gender CHAR(1), birthdate DATE, email VARCHAR(100), salary INT, UNIQUE (first_name, last_name));In...