1 PostgreSQL function param json_populate_recordset ARRAY problem 1 Recommended procedure to remove old files after major version PostgreSQL database cluster upgrade 2 Creating a TYPE that is an Array within a Function (or a predefined Array TYPE) in PostgreSQL 1 How to keep array fields ...
PostgreSQL offers a wide range of built-in functions that can be used with the CONCAT() function to achieve different functionalities. For example, if we want to concatenate only the publishing year instead of the complete date, then we can use the DATE_PART() function with the CONCAT() fu...
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This is because PostgreSQL keeps row visibility information in the row itself, not anywhere else, so any accurate count can only be relative to some transaction. You're getting a count of what that transaction sees at the point in time when it executes. You could automate this to run agains...
How to concatenate columns in a Postgres SELECT? Can declaring function volatility IMMUTABLE harm performance? Fixed a logic issue while being at it: $2 = 0 checks for division by zero properly (unlike $2 > 0). Now, count(*) can never be negative, but since you put the logic ...
In order to concatenate more than two strings, we can use either the string concatenation operator (||) or CONCAT() function provided by PostgreSQL. The CONCAT() function is a built-in function provided by PostgreSQL since version 9.1. We can pass an array of string elements to the PostgreS...
The || operator will concatenate the new JSON object with the previous one. Now, to insert {"GPU":"RTX 3060"} to PC1, the SQL query will be:UPDATE product SET details = details || '{"GPU":"RTX 3060"}' WHERE product='PC1'; ...
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You have this tabletable_a: And now you want to group them byid, and concatenate therandom_characterinto one string for each group. Here is the expected output: Use theGROUP_CONCATEfunction: SELECT id, GROUP_CONCAT(random_character SEPARATOR '') AS out_put ...