Sample table schema: Requirement: Fetch rows that match any of the tuples (col1, col2) presented in an array. SQL: I want to write this query in Go using the “database/sql” package with “github.com/lib/pq” driver, and that is where I am facing the problem. I can easily do this for single column IN/ANY query. for example, the following query can be
Tag: database
Many-to-Many Link Table Foreign Key Modeling in SQLite
I have the following two tables in SQLite: Many Main rows may reference the same link id, and many Link rows may have the same link id, such that select * from Main natural join Link where main_id=1 will return N rows, and select * from Main where link_id=1 will return K rows. The link id is important, and the
get all the tables within a date range
I have many weekly backup tables of the same structure and columns but with different names containing some user-specific information like this. Now I want to find the tables within a date range for example: If I choose the date range of 2021-11-20 to 2021-11-13 then the tables fetched would be user_details, user_details_20211126, user_details_20211119 for using them in a query
Query monitoring changes in the field
I need to program a query where I can see the changes that certain fields have undergone in a certain date period. Example: From the CAM_CONCEN table bring those records where the ACCOUNT_NUMBER undergoes a modification in the CONCTACT field in a period of 6 months before the date. I would be grateful if you can guide me. Answer You
Generate Scripts to move a database from one server to another
I want to move a database from our testing server to my local server. I don’t have the option of back up and restore since I don’t have permission. So I decided to use the generate script option to create all the scripts for the DB and then move over the database to my local server. The problem I’m facing
FOR XML PATH produces only first item
I have two tables: Reservations and ReservationNights (every reservation has many nights). In a stored procedure, I have a variable that looks like this: @roomTypeList = ‘2;3;4;5;’ -> its a list of RoomUseIds. I need to display only the reservations that have a reservation nights with one of those Ids (In this example, it should display only reservation 14105, because
How does a multi-column index work in MySQL?
More specifically, what data structure does MYSQL use for multi-column indexing? I know MYSQL use Btree for indexing, which can only index one column. How does multi-column indexing work then? Answer Think of a MySQL “composite” index this way. Concatenate all the columns in the index together, then build an BTree index on that ‘single’ string. Some related comments: Once
How to select records from a Postgres table using an ORDER BY statement on a jsonb column that points to another table
I have two tables, characteristics and students. characteristics students The characteristics table has three columns where the id column is an auto-increment field. The name denotes the name of a specific characteristic and the value indicates the respective information about the characteristic. The students table contains detail about each student. The character_value field in the students table is a jsonb
Checking if date in table B is between date in Table A before inserting SQLite
I have a table called Project with start and end dates. I also have a table called Plan which have its own start and end dates column. But I some way to validate that the Plans start/end date is between the matching Project start/end date. I dont know if its appropriate to add a check when I create the table
Update column of a table with new foreign key of associated table
Let’s say I have a Persons and Books table that were associated. Currently persons.usercode serves as the primary key and hence the foreign key on associated tables. I would like to change the primary key of the persons table to persons.uid. So now I want the books table to look like Dropping and adding the new primary key constraint shouldn’t