| BK | ⊕ 1986 | ↓ ↑ ⊕ Business Data Processing | ⊕ France | Deductive database calculus | |
| MQL | ⊕ 1986 | ↓ ↑ ⊕ Business Data Processing | ⊕ Ad hoc query languages | ⊕ United States | Modular Query Language |
| Nail | ⊕ 1986 | ↓ ↑ ⊕ Business Data Processing | ⊕ United States | ||
| POSTQUEL | ⊕ 1986 | ↓ ↑ ⊕ Business Data Processing | ⊕ United States |